x402 Verification API
x402 verification APIs: proof, attestation, and validation endpoints that accept x402 payments per call. Agents can discover, price, and call these services per request, settling onchain through the HTTP 402 flow.
VERIFICATION SERVICES ── 87 total ── for live status visit /status
STATUS ── ● online · ◐ degraded · ○ offline · ─ unknown ── live health, see /status.
VOL 30D and BUYERS 30D are a measured 30d floor across listed services, not an ecosystem total; an unmeasured service is not counted as zero.
·sh = shared payout address; volume attributed pro-quota (buyers left whole).
| STATUS | NAME | DESCRIPTION | EP | FROM $/REQ | UPTIME 24H | VOL 30D | BUYERS 30D | NETWORKS |
|---|---|---|---|---|---|---|---|---|
| ● | StillOS Notary | Signed x402 verification and screening primitives: claim notarization, resolver-graded verdicts, OFAC SDN screening, and validated corporate distress scoring, backed by an on-chain correctness bond. | 2 | $0.10 | 100.00% | $0.25 | 3 | BSE |
| ● | BaseCheck | Plain-English activity and risk summary for any Base wallet or contract address: balance, recent transaction count, failure rate, counterparty diversity, and decoded function calls, synthesized by an LLM from live Blockscout data. $0.03 USDC on Base via Coinbase CDP facilitator, Bazaar discovery on every 402. No API keys, no signup. | 3 | $0.01 | 100.00% | $0 | 0 | BSE |
| ● | Dokimo Verify API | Pay-per-call x402 endpoint that independently recomputes a Merkle evidence proof to its committed root and returns a signed attestation. Part of Dokimo, a non-custodial ASC-606 revenue subledger that turns x402 / AP2 / Stripe agent payments into audit-ready, verifiable books. | 1 | $0.01 | 100.00% | $0.63 | 12 | BSE |
| ● | Datasource Pulse | One live health check on a data source, one instant machine-readable verdict. Monitor an Apify actor, API, or scraper for failures; check whether an API key silently failed; detect schema drift, stale data, empty results, dead credentials, rate limiting, and quota exhaustion. Validates keys for 35+ vendors (OpenAI, Anthropic, Stripe, GitHub and more), any HTTP endpoint, or a public Apify actor by id. Returns JSON: state, failure_class, message, recommended_action, latency_ms, metadata. | 1 | $0.02 | 100.00% | $0.02 | 1 | BSE |
| ● | RootCrak Preflight | Before an agent pays or connects, it can buy a drainer + domain preflight over x402. Fail-closed. Signals, not a SAFE stamp. USDC on Base and Solana. Intelligence, not warranty. | 2 | $0.05 | 100.00% | $3 | 2 | BSE/SOL |
| ● | verza | South African verification primitives for AI agents: identity and VAT number validation, and NCA credit-agreement lawfulness checks against the Regulation 42 interest caps. CIPC company lookup in development. Paid per call via the x402 protocol (USDC on Base). No accounts, no API keys. | 2 | $0.01 | 100.00% | $0.30 ·sh | 10 | BSE |
| ● | Spoolis | Verify whether delivered work satisfied explicit acceptance criteria. One call, pay per verification, no account. Returns per-unit accepted/rejected counts, earned value, and a signed Outcome Receipt. | 1 | $0.0101 | 100.00% | $5 | 5 | BSE |
| ● | x402-tools / OpenClaw Productions diagnostics | Paid x402 diagnostics for agents. 19 Unique SKUs + 8 samples on Base USDC via OpenX402. pipecheck $0.02 plus free /api/v1/pipecheck/sample. Includes localhosttrap, icesrc, facvsdrift, sigclass, wxsrc, decscale, nportchg, geocode, edgar, listcheck, paytohealth, settleproof, renttrap, buyerwatch, facdiff, watchlist, pulse, radar. | 19 | $0.01 | 100.00% | $0.07 | 3 | BSE |
| ● | HostDeFi Token Risk API | Token safety verdicts (A+ to F grade, score, on-chain + market-structure signals) for Solana and EVM tokens, paid per call via x402 (USDC on Solana, Base, Polygon, Arbitrum, Avalanche; charge-on-success only). Also sells per-token dated safety history, a full due-diligence report, pre-graduation Solana signals, wallet exposure reads, a fresh-launches feed, the graded weekly snapshot dataset, Polymarket odds history and x402 provider-risk grades. Free scanner + hosted MCP server included. | 10 | $0.005 | 100.00% | $0 | 0 | ARB/AVX/BSE/POL/SOL |
| ● | Orbylon | Orbylon checks whether a business can be found, trusted and paid by AI agents. The paid endpoint runs sixteen checks against any domain and returns the complete machine readable result, plus a hosted report URL a person can read. Settlement is USDC on Base, direct to the seller wallet. Orbylon never holds funds. | 1 | $0.05 | 100.00% | $0.10 | 2 | BSE |
| ● | Herramientas Cobrables | Small deterministic pay-per-use services for AI agents: JSON contract validation, business margin and break-even calculations, and public stock quotes. Payments settle with x402 v2 using USDC on Base. | 3 | $0.01 | 100.00% | $0 | 0 | BSE |
| ● | HexScan | Is this token safe to buy? Honeypot detection, rug-pull and scam check for any ERC-20 token. Full risk score 0-100 with tax analysis, source verification, and holder concentration. GoPlus-powered token security scan. Not an audit. | 2 | $0.001 | 100.00% | $0.21 | 6 | BSE |
| ● | CopperheadAI | Security audit for Move smart contracts on Aptos and Sui. Post Move source or a GitHub URL and get back a structured report with findings graded by severity. | 1 | $2.00 | 100.00% | $0.95 ·sh | 34 | BSE/SOL |
| ● | 10x402 | x402 conformance lint: 75 checks against your live 402 with a specific fix for each finding, plus a separate Bazaar-indexability verdict. Every check cites its source (spec, client code, or CDP validator). The service lints its own 402s in CI and pays over x402 itself (v1+v2 dual-stack). Open source: github.com/chronick/10x402 | 4 | $0.004 | 100.00% | $2 | 7 | BSE/SOL |
| ● | x402check | Live x402 conformance pre-flight check. Pass ?url=<x402 endpoint> and get a structured PASS/WARN/FAIL verdict on its HTTP 402 challenge — wire-version detection, EIP-712 domain completeness, accepts[] schema validity, payTo and amount sanity — before you trust it with a real payment. | 1 | $0.002 | 100.00% | $0.03 | 3 | BSE |
| ● | AEGIS | Pay-per-call USDC on Base. Independent verification, multi-source synthesis, and six-check network forensics from a self-hosted US vantage. No API key. Unpaid calls return HTTP 402. Agent work is POST /v2/*. Operator: McX Ventures, LLC. | 11 | $0.25 | 100.00% | $18 | 2 | BSE |
| ● | Sentinel Global Check | Check any URL from four monitoring regions at once (US East, US West, EU, Asia) and get per-region reachability and latency with a consensus verdict. $0.02 per check, no account needed. Runs on Sentinel's production uptime monitoring fleet. | 1 | $0.02 | 100.00% | $0.95 | 4 | BSE |
| ● | SendCheck | Pre-send address verification for stablecoin withdrawals: one paid POST /check ($0.01) parses address + token contract, probes live RPCs and exchanges, and returns a warn-level verdict before you send USDC. POST /deep ($0.05) adds extended checks. | 2 | $0.01 | 100.00% | $0.18 | 5 | BSE |
| ● | TinyOps Automation Integration Preflight | Public-page automation readiness and acceptance-pack API. Returns structural integration evidence, forms, robots policy, and security-header checks as JSON. | 2 | $0.03 | 100.00% | $0.03 | 1 | BSE |
| ● | Hermes Plant | Deterministic pre-execution safety gates and signed evidence for AI agents. The Action Safety pair scores consequential shell, Git, SQL, infrastructure, and deployment commands, returning risk, matched rule IDs, and an exact machine-readable escalation call: $0.01 for the quick preflight, $0.25 for the full workflow with a signed receipt and free verification. High and critical outcomes are needs_review and are never represented as human-approved. Also includes wallet, MCP-server, and email risk scoring, x402 payment-policy decisions, demand-provenance checks, and deterministic finance math (DCF/IRR, Black-Scholes greeks, PE distribution waterfalls). Every route is on Base mainnet, settles through the CDP Facilitator, needs no account or API key, and is priced at or below $0.25. | 19 | $0.01 | 100.00% | $0.02 | 2 | BSE |
| ● | Email Verifier | Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call. | 1 | $0.01 | 100.00% | $0 | 0 | BSE/SOL |
| ● | Bounty Truth API | Deterministic preflight risk checks for public GitHub bounty issues. Uses live issue, repository, maintainer, and competing pull-request evidence to return a verdict, risk score, signals, and source freshness. x402 v2, $0.001 USDC on Base, no account or API key. | 1 | $0.001 | 100.00% | $0 | 0 | BSE |
| ● | Geolithic | A sworn reading of what the Earth was doing at a place and a moment: the wind at the mesh corners around the point, the Merkle opening to a public chain, and the RFC 3161 anchor that proves the reading existed before you asked. Also a hash chained beside the Earth's tick (POST /api/stamp). Two cents each over x402 on Base, no account. A resolution source that committed before the outcome; a moment not yet chained is refused, never substituted. | 2 | $0.02 | 100.00% | $5 | 1 | BSE |
| ● | IntentFence | Pre-transaction policy and quote safety checks for autonomous AI agents. Agents can pay per request in USDC on Base via x402 to receive bounded risk assessments and signed verification receipts. | 1 | $0.005 | 100.00% | $0 | 0 | BSE |
| ● | PreFlight Checker | Pre-flight checks for autonomous agents: verify a package, repo, domain, or another x402 service before you trust it. Code checks (npm trust score, GitHub repo health), network checks (domain liveness), and ops checks (x402 service diagnostics). $0.02-$1.00 per call via x402 on Base, no signup, no API key. | 4 | $0.02 | 100.00% | $4 | 2 | BSE |
| ● | Endpoint Liveness Probe | A measured verdict on whether an endpoint is actually alive. Every reason carries the source it was read from. Sold per call over x402 on Base: probe ($0.01/call, GET /x402/probe); report ($0.50/call, GET /x402/report); batch ($0.10/call, POST /x402/batch). | 3 | $0.01 | 100.00% | $0.03 | 3 | BSE |
| ● | Lazaretto | Deterministic pre-install verification for npm packages, AI agent skills and MCP tools. The free lockfile check matches every exactly pinned dependency against OSV and OpenSSF malicious-package advisories with no account. A paid scan adds behavioral analysis with file-and-line evidence. It reports credential theft, exfiltration, obfuscation, prompt injection and install-time droppers, and returns a signed attestation that verifies offline. No LLM runs in the scan path, so the same input yields the same verdict. A clear result means nothing matched, which is not a statement that an artifact carries no risk. | 2 | $0.03 | 100.00% | $0.18 | 3 | BSE |
| ● | RattlerAI | Automated security audit for Solidity and EVM smart contracts, returning a Markdown report with findings by severity, proof of concept snippets and remediation notes. $2 USDC per call on Base or Solana. | 1 | $2.00 | 100.00% | $0.94 ·sh | 34 | BSE/SOL |
| ● | nsgoods — verifiable x402 oracle suite | Signed, verifiable pay-per-call x402 oracles for AI agents, settling in USDC on Base and Solana. Every paid answer is ECDSA-signed and appended to a public, tamper-evident hash chain, so an agent can verify authenticity before trusting it. On this domain: signed Solana settlement verification and signed monitoring of any x402 endpoint (Watchdog). Free signed preview on every service. | 2 | $0.01 | 100.00% | $0 | 0 | BSE |
| ◐ | PayPerByte | Verify-before-act oracles for x402 agents. 10 live feeds; flagship merchant-screen $0.10/verdict — signed ALLOW/WARN/BLOCK on the domain, address and price you supply, with an EIP-712 attestation over the exact response bytes (authenticity, not correctness). Cheap try-it feeds from $0.003. | 22 | $0.003 | 100.00% | $0.77 | 19 | BSE |
| ● | Cleared Index Paid Probe | Genuine HTTP 402 paid probe for Cleared Index ($0.001 USDC on Base). Trust evaluate (POST /api/cleared/trust/evaluate) and Check remain free with Ed25519 attestations + public JWKS — listing the paid probe so x402-list monitors can verify settlement. gold-402: Endpoint Trust & Reputation. | 1 | $0.001 | 100.00% | $0 | 0 | BSE |
| ● | 767-2676.com - POPCORN | POPCORN provides paid, signed temporal checkpoints for autonomous agents. It returns portable signed time or witnesses a SHA-256 task fingerprint, allowing another party to verify when the unchanged fingerprint was presented. Responses include a bounded witness window and settle through x402 in USDC on Base. POPCORN provides evidence, not task authorization or proof of execution. | 2 | $0.001 | 100.00% | $0.08 | 8 | BSE |
| ● | ACE — Autonomous Commerce Engine by Black Knight Technologies | Evidence-backed x402 assurance APIs for part identity, source commercial-use checks, evidence provenance, rights clearance, and release certification, paid in Base USDC. | 5 | $0.01 | 100.00% | $0.06 | 1 | BSE |
| ● | Council of AI | Independent measurement artefacts for AI behaviour. Free loginless verify at /gspc-verify. x402 micropayments on artefacts only — never a score, grade, badge, or certificate. Living board GET /api/gspc. OpenAPI https://councilof.ai/openapi.json | 5 | $0.01 | 100.00% | $0.23 | 23 | BSE |
| ● | pkgproof | pkgproof is a package-verification oracle for AI coding agents. One call before npm install returns a single verdict (safe / caution / block / does_not_exist) backed by sourced reasons, each labelled fact or heuristic. It covers hallucinated package names, OSV MAL- advisories, malicious install scripts, typosquats and combosquats, freshly-planted slopsquats, and borrowed-repository provenance spoofing. If a data source is unreachable it answers 502 rather than vouching for a package it could not check. | 1 | $0.05 | 100.00% | $0.40 | 3 | BSE |
| ● | scvd.store — evidence observatory for the x402 economy | scvd.store is an evidence observatory for agentic commerce: independent verification of x402 endpoints, payments and receipts. Before an agent pays an x402 endpoint, we check that it can be paid. After it pays, we check the signed receipt. Over time we watch endpoints and publish a dated, signed corpus. Sellers use it to prove a door works; buyers use it before spending. Every artifact is signed, expires, and names what we did not see. Not escrow, not a rating, not a guarantee. Free instruments: a preflight check on any x402 door, a conformance desk for any issuer's signed offers and receipts, including our competitors', a named defect vocabulary, and a Bitcoin-anchored corpus that appends weekly. Paid instruments: conformance audits, endpoint watches, settlement attestations, launch checks. Never a ranking, and never a verdict without its derivation and denominator beside it. Operated by Record Creative Co. LLC. | 32 | $0.001 | 100.00% | $927 | 18 | ARB/BSE/POL/SOL |
| ● | badhttp | A test server for x402 client implementations: the payment IS the scenario under test, not a toll on data. /402/pay/base is a real, settling x402 paywall (0.01 USDC on Base by default, ?amount= 0.001-1.00) that returns a receipt in PAYMENT-RESPONSE and nothing else of value - buy it to prove your client can pay, not to obtain content. Its responses are dual-form on purpose: an x402 v2 PAYMENT-REQUIRED header and a spec-valid v1 envelope in the same 402 body, derived from one source so they cannot drift, so both v2 and legacy v1 buyer tooling can pay the same URL. Around it sit ~19 deliberately misbehaving payment scenarios that never settle and never contact a facilitator - a 402 that ignores every valid payment, one that asks for 1,000,000 USDC, one naming a nonexistent chain, one returning a corrupt receipt, and ten malformed 402 envelopes - so you can test what your client does when a paywall is broken or hostile. Also a free, no-signup catalogue of ~140 other HTTP edge cases (content codings, ranges, conditional requests, cookies, auth challenges, SSE) as machine-readable NDJSON at /corpus.jsonl. Stateless, no signup, nothing stored about callers. Costs and revenue are published on-chain-reconciled at /books. | 3 | $0.01 | 100.00% | $0 | 0 | BSE/BSP |
| ● | TrustFetch | Safety/content tools for AI agents: scan text for hidden prompt-injection attempts, or fetch+clean a webpage with built-in injection screening before your agent acts on it. | 5 | $0.015 | 100.00% | $0.06 ·sh | 5 | BSE/SOL |
| ● | VirtualSMS | SMS verification for AI agents using real carrier numbers across 145+ countries and 2500+ services. Pay per verification at catalogue price in USDC or USDT on Base, BNB Chain, or Solana via x402 — or fund a balance and receive an API key that also works for rentals, proxies, and Cloud Browser. Hosted MCP server available. | 2 | $0.10 | 100.00% | $0 | 0 | BSE/SOL |
| ● | NSGoods Payable Preflight | Signed x402 payability preflight. Before an agent pays an endpoint, one call returns whether the counterparty can actually receive the payment: verdict plus reason classification, method aware (GET and POST), Solana ATA existence checked on chain. Every response carries an EIP-191 signature verifiable offline. Free preview endpoint; paid calls from $0.005 on Base and Solana. | 1 | $0.005 | 100.00% | $0 | 0 | BSE/SOL |
| ● | ForgeMesh x402 Notary | Cryptographic receipts for AI outputs: signed Ed25519 attestations, sha256 content hashes, Merkle chain-anchoring on Base or Solana. $0.001 per notarization via x402; verification free, no wallet needed. | 2 | $0.001 | 100.00% | $0.02 | 4 | BSE |
| ● | Umpire | A neutral third party for agent commerce. Buy an Ed25519 signed pass or fail verdict on a deliverable against a machine readable acceptance spec (JSON Schema, JSON path, content hash, regex, length, live URL probe), verifiable offline by anyone against a published key. The witness tier ($0.25) fetches one public URL and signs what it saw (final URL, status, resolved address, TLS fingerprint, headers, body sha256) as proof against agent false success. Also sells reputation reads on merchant wallets built only from payment verified feedback. $0.01 to $5.00 per document, USDC on Base or Solana, no account. | 5 | $0.01 | 100.00% | $0 | 0 | BSE/SOL |
| ● | ARAKEL Machine Evidence Network | Machine-verifiable official-source evidence with free preflight and x402 payments. OFAC sanctions and wallet screening, FDA recalls, USAspending federal awards, Federal Register search, signed proofs, batch checks, and counterparty dossiers. | 4 | $0.005 | 100.00% | $0.09 | 5 | BSE |
| ● | x402 Discovery Launch Pack | A pay-per-download implementation pack for making x402 v2 endpoints discoverable and CI-auditable: OpenAPI x-payment-info, Bazaar discovery metadata, well-known manifest, and automated checks. | 1 | $0.05 | 100.00% | $0 | 0 | BSE |
| ● | Automaton Colony Flash Audit | AI security screening of smart contracts and B20 native tokens on Base (chain 8453). Pay 3.49 USDC over x402 (EIP-3009, CDP facilitator) and receive a JSON report with its SHA-256 inside; the report hash is anchored on Base at purchase. Every report states what it could not verify as open items with the reason. A free check with no wallet returns observed data only (verified source, proxy, admin selectors, holder concentration, B20 issuer powers). | 1 | $3.49 | 100.00% | $8 | 5 | BSE |
| ◐ | x402 Trust Prober | Deterministic trust scoring and monitoring for the x402 ecosystem. 88k+ endpoints tracked 24/7 on Base + Solana: probe reliability, latency, spec compliance, price history, and real on-chain USDC settlement per endpoint. Paid API: per-endpoint trust score with live re-probe, bulk scoring tiers (10-500), endpoint history, similar-endpoint discovery, payment tracing, and 30-day watch subscriptions with webhook/Slack alerts. Free: trust preview, leaderboard, ecosystem report, embeddable badges. Scoring is a deterministic formula - no LLM in the loop, fully explainable. | 10 | $0.005 | 100.00% | $3 | 21 | BSE |
| ● | Sentinel-01 | Deterministic x402 v2 endpoint compliance auditor on Base. Send any x402 endpoint URL and get back a structured JSON report on its protocol conformance: challenge validity, scheme and network correctness, header and payload shape, and settlement behaviour. Fail-closed by design: no report is produced without a valid payment, and the auditor never pays the audited target nor writes on-chain. Deterministic: the same endpoint and input always yield the same report, so results are reproducible and citable. Identity anchored at ERC-8004 #60396. | 1 | $0.05 | 100.00% | $0 | 0 | BSE |
| ● | Delvorn ASSET-TEST-FE2B3590 | $1 USDC on Base. GET 402, no API key. Agent created after settle. Replay-protected test SKU. | 1 | $0.05 | 100.00% | $1 | 6 | BSE |
| ● | IBANforge | IBAN validation and BIC/SWIFT lookup backed by primary bank registries (GLEIF, SIX, Bundesbank, EBA, Bank of England). Returns bank identity, SEPA and Verification of Payee reachability, sanctions and risk flags, Swiss clearing detail, ISO 20022 structured addresses. Pay per call in USDC via x402, no account needed. MCP server available for AI agents. | 3 | $0.002 | 100.00% | $0.02 | 2 | BSE |
| ● | Sourcey Startup Review | Evidence-backed human review of startup credit and startup program submissions, paid per review using x402 on Base. | 1 | $49.00 | 100.00% | $0 | 0 | BSE |
| ● | Money Mind | Statistical adjudication for agents: you tried N prompts, models or strategies and kept the best - is the winner real, or the search? Eleven endpoints, each answering one question and each able to answer no. Plus verified web extraction cross-checked three independent ways and confidence-scored. Public tamper-evident attestation chain, refund-backed, no account. | 10 | $0.20 | 100.00% | $0.02 | 1 | BSE |
| ● | TaskForge Agent Assurance by Black Knight Technology | Pay-per-request assurance audits for agent permissions, MCP security, CI/CD supply chains, x402 commerce integrity, service health, and release readiness. Returns deterministic, evidence-bounded verification results. | 8 | $0.05 | 100.00% | $0 | 0 | BSE |
| ● | Data Quality Gate | Clean scraped data and assess data quality before an agent acts on it. Three POST endpoints, all deterministic and LLM-free: identical input always returns byte-identical output, so results are cacheable and replayable. POST /api ($0.01) - dataset quality verdict. Send a JSON array of rows; get a 0-100 score, a RELIABLE / USABLE_WITH_CLEANING / UNRELIABLE judgement, and exact per-check facts: completeness, nulls, type consistency, impossible values, exact and near duplicates, statistical outliers, cardinality. On financial data it also reports cross-source price divergence for the same asset. POST /api/clean ($0.04) - deterministic data cleaning. The response body IS the clean data: post a JSON array of row objects and the same array comes back repaired; post one object and one object comes back; post plain text and text comes back. CSV is accepted and returns parsed rows. Fixes broken encoding and mojibake ("Café" becomes "Café"), strips leftover HTML tags and entities, removes zero-width and invisible characters and non-breaking spaces, normalises whitespace. Repairs how data was encoded, never what it says: a negative price is reported, not rewritten. Flags failed extractions such as captcha walls and error pages instead of passing them off as content. POST /api/clean/audit ($0.12) - the same repaired data plus a reversible ledger of every transformation. Replaying it backwards reconstructs the exact input, byte for byte. Use it to clean scraped data, fix encoding, remove HTML from text, deduplicate rows, validate dataset contents, assess data quality, and decide whether to trust data before ingesting, indexing or trading on it. Never destroys a legitimate value: "None" stays a surname, "NA" stays Namibia, a Persian ZWNJ and an emoji joiner survive untouched. The full ruleset is published at GET /api/clean, readable before paying. Also a free Python library: pip install scrubkit. | 3 | $0.01 | 100.00% | $0.26 | 5 | BSE/SOL |
| ● | Audit Tools | Evaluate an Apify actor before you use it. Send one actor ID (for example apify/instagram-scraper) and get an evidence-backed quality report: 23 built-in criteria like reliability, 30-day failure rate, advertised-field truth, and cost per usable item, deep-scan criteria measured from live funded runs, or your own rubric in plain English. Use it to audit a scraper, compare actor quality, or pick the best actor. Returns JSON with per-criterion scores, evidence, and a verdict. | 1 | $1.00 | 100.00% | $1 | 1 | BSE |
| ● | nsgoods Sanctions Screening Oracle | Multi-chain OFAC SDN exact-address screening. 960 sanctioned addresses across 19 chains, parsed directly from the US Treasury sdn_advanced.xml, including the Solana entries the Chainalysis on-chain oracle cannot see because it is EVM only. Every response is ECDSA-signed and carries sdn_snapshot_at, so a caller can prove which version of the list was used. The raw source file is hashed every six hours into a public append-only chain anchored to Bitcoin: https://sanctions.nsgoods.org/sdn-log/. Free preview on every endpoint, no account and no API key. Settles in USDC on Solana mainnet. | 1 | $0.005 | 100.00% | $0 | 0 | BSE/SOL |
| ● | LION — Verified Company & Compliance Data | AML wallet + company counterparty checks for AI agents. $0.001 wallet-screen (PASS/WARN/BLOCK OFAC check), $0.05 compliance bundle (OFAC + domain trust + firmographics), $0.012 deep research, $0.95 verified company file. Ed25519-attested JSON, keyless x402 on Base USDC. Buyer pack: https://lionx402.com/for-agents | 5 | $0.001 | 100.00% | $7 | 31 | BSE |
| ● | Steve Guard | Robinhood-chain (4663) & Solana token safety + dollar-weighted NET-USD accumulation footprint. Honeypot/rug detection via real buy+sell simulation, plus net-USD flow (accumulation vs distribution) that trade-count checks miss. The only service covering Robinhood-chain net-USD. | 1 | $0.02 | 100.00% | $0 | 0 | BSE |
| ● | Council of AI GSPC | Independent AI governance MEASUREMENT body. Free door at /api/free-door returns live GSPC board totals and signed root at price zero. Measurement, not certification. Paid artefacts catalogued at /api/x402. MCP at /mcp. | 2 | $0.00 | 100.00% | $0 | 0 | BSE |
| ● | Sharvora | Sharvora is a pay-per-request trust, verification, decision, and evidence layer for autonomous agents. It helps an agent inspect unfamiliar public endpoints before trusting or paying them, with machine-readable checks for agent readiness, redirects, HTTP policy, browser security headers, TLS posture, prompt-injection/exfiltration language, x402 metadata, and related decision evidence. | 1 | $0.001 | 100.00% | $0.005 | 5 | BSE |
| ● | Rubric Protocol — Post-Quantum AI Attestation | Post-quantum attestation and evidence services for AI agents. Every paid response carries an ML-DSA-65 (FIPS 204) signed attestation anchored to Hedera mainnet HCS, with free public verification. Catalog: pay-per-call decision attestation from $0.005, bulk hash anchoring from $0.000027/record, attested gpt-4o-mini inference binding prompt and response hashes to the exact model version, agent operating-history lookups computed from records that cannot be backdated, independent attestation audits with mirror-node confirmation, attested Hedera network facts from $0.001, and a regulatory-change feed for AI systems. A failed mint is never charged. | 10 | $0.001 | 100.00% | $17 | 36 | BSE/SOL |
| ● | DNS Doctor | DNS and email-authentication diagnostics for AI agents: SPF, DMARC, DKIM, MX, blacklists, domain/SSL expiry and six-vantage propagation, with deterministic copy-paste fix records. Bulk scans and 24h propagation/HTTP-ping watches are paid per call over x402 (USDC on Base, v1 and v2); single scans are free up to a per-caller limit. | 3 | $0.004167 | 100.00% | $0.07 | 3 | BSE |
| ● | KHOTEM — Cryptographic Witness | KHOTEM is a cryptographic witness for AI agents: seal (SHA-256 commitments), attest, verify, timestamp and audit, plus three paid operational-law documents for agent builders. x402 v2 with EIP-712-ready accepts on Base, Polygon and Solana. Direct on-chain USDC verification — no facilitator, no accounts, no API keys. Pay per request, present the settlement txHash in X-PAYMENT. Machine-readable via OpenAPI, Bazaar discovery extension, skill.md, AGENTS.md and llms.txt. | 8 | $0.02 | 100.00% | $2 | 4 | BSE/POL/SOL |
| ● | FractalAI � Post-Quantum Proofs for AI Agents | Post-quantum (CRYSTALS-Dilithium-2, NIST FIPS 204) services for autonomous agents, payable per call in USDC on Base: Dilithium-2 signing, PQC signature verification, AI decision attestation (VAID-1), training-data attestation (C2PA), provenance sealing (drand + on-chain), CBOM cryptographic-inventory sealing, and Know-Your-Agent identity verification. Self-facilitated (EIP-3009 gasless) with a facilitator-less txHash fallback. Signatures are anchored on the FractalAI L1 with a public, verifiable attestation permalink. | 7 | $0.01 | 100.00% | $0.80 | 4 | BSE |
| ● | Second Opinion | Adversarial verification for AI agents: an independent skeptic attempts to refute a claim before the agent acts on it, returning a structured verdict (refuted / supported / inconclusive) with calibrated confidence, findings, and citations. Three tiers: quick reasoning check ($0.03) · single skeptic with live web research ($0.20) · three-skeptic panel with majority vote ($0.75). Every verdict carries an Ed25519-signed receipt verifiable offline against our published key. Accuracy benchmarked on the full public AVeriTeC dev set — 78.2% overall, 95.7% on refuted claims — with method and failures published at secondopinionx402.com/benchmark. Zero-install hosted MCP connector at /mcp; Python client: pip install secondopinion-x402. USDC via x402 on Algorand, Base, and Solana; no accounts, no API keys. | 6 | $0.02 | 100.00% | $0.80 | 1 | BSE/POL/SOL |
| ● | probe402 | Independent health, price and history lookups for x402 and MPP endpoints. probe402 probes a fixed seed list on a clock, archives every observation immutably, and answers: alive right now? quoting what? price or schema changed? blocked, or actually dead? The grade is free; history depth is paid. Operated by a named person; not affiliated with any rail operator or graded endpoint. Method, rubric and corrections: https://probe402.com/method | 3 | $0.005 | 100.00% | $0.005 | 1 | BSE |
| ● | Vibes-Coded Agent Tool API | Pay-per-call JSON Outcome APIs for AI agents via HTTP 402 (x402 USDC). Solana primary; Base ExactEvm (eip155:8453) with USDC EIP-712 extra.name/version. ~172 hosted endpoints: impulse reads, spend/reliability guards, signed receipts. No signup. Trial: POST /api/v1/outcomes/balance/trial/claim. Fund: https://vibes-coded.com/start. Publish your own API: https://vibes-coded.com/publish-endpoint. Agent index: https://vibes-coded.com/llms.txt. MCP: vibes-coded/vibes-coded-agent-tools (24 tools). | 11 | $0.02 | 100.00% | $0 | 0 | BSE/SOL |
| ● | PHION Agent Trust | Ultra-low-cost cryptographic integrity, declared-provenance and freshness receipts for AI-agent JSON, paid per call with x402 on Base. | 1 | $0.001 | 97.96% | $0.43 | 5 | ARB/BSE/POL/SOL |
| ● | Butterfly Delta Order Preflight | Exact-order execution-integrity preflight for autonomous crypto trading agents. Before each Coinbase or Gemini USD spot order, check venue availability, spread, quote freshness, visible depth, estimated slippage, and cross-venue divergence; receive a signed five-minute PASS, BLOCK, or UNKNOWN gate for $0.01 USDC on Base. | 2 | $0.01 | 97.96% | $0.03 | 3 | BSE |
| ● | CottonmouthAI | POST /audit with Rust smart contract source or a GitHub URL and it returns an LLM generated security audit report, with per finding severity, description, proof of concept and fix. Covers CosmWasm, Anchor/Solana, Soroban and NEAR. $2 USDC per call on Base or Solana. | 1 | $2.00 | 97.96% | $0.95 ·sh | 34 | BSE/SOL |
| ● | M0 Email Verification | Validate an email address before your agent spends money enriching, contacting, or storing the lead. RFC-shaped syntax check plus live domain DNS resolution in under 2 seconds. Does not confirm mailbox existence -- honest about what a sub-second, zero-dependency check can prove. | 1 | $0.005 | 97.96% | $0 | 0 | BSE |
| ○ | AgentTrustAPI | Deterministic delegated-payment-authority verification for AI agents. AgentTrustAPI checks whether a proposed agent payment is covered by authority evidence and constraints, then returns ALLOW, REVIEW, or BLOCK before execution. Currently available on Base Sepolia testnet; mainnet is intentionally locked. | 2 | $0.01 | 86.11% | $0 | 0 | BSE |
| ● | SALT19 Agent Utility Grid | MCP/x402 decision and verification utilities for autonomous software agents, paid in USDC on Base. | 14 | $0.01 | 83.67% | $0.01 | 1 | BSE |
| ○ | M2M Sentinel | Deterministic Base mainnet transaction preflight and static bytecode capability evidence with PUSH-aware opcode analysis, proxy and EIP-7702 resolution, explicit unknown states, and x402 v2 access. It does not provide a safety guarantee. | 6 | $0.005 | 66.67% | $0.78 | 14 | BSE |
| ○ | Vianerds Page Signal Audit | Deterministic pay-per-call audit for supplied static HTML. Returns a 0-100 launch-risk baseline with exact SEO, social sharing, accessibility and markup evidence plus prioritized fixes. The endpoint does not fetch or mutate websites and makes no ranking claim. | 1 | $5.00 | 0.00% | $0 | 0 | BSE |
| ○ | Xingchen SentriScan ASP | Official storefront https://asp.xhdym.sbs. 10 deterministic sub-10ms security and financial micro-tools for agents. Zero LLM, zero private key. x402 v2 USDT0 on X Layer. 3 free calls per IP per day then pay-per-call. Health /health Manifest /.well-known/x402. | 10 | $0.01 | 0.00% | --- | --- | |
| ○ | Permit Verdict Settlement Oracle | Settlement oracle for crypto price events. Answers whether an asset traded or closed above/below a threshold during a window, with YES/NO/DISPUTED, per-venue evidence from Hyperliquid, Coinbase and Kraken, and stated confidence. Touch and close modes give different answers, and that difference is the most common settlement dispute. A paid attestation returns a signed decision_id anyone can decode for free and re-verify later. Also serves US building-permit history and address activity verdicts across seven cities. No API key, no account, no signup. | 4 | $0.01 | 0.00% | $0 | 0 | BSE |
| ○ | Nishvault x402 Pre-Send Guard | 0.01 USDC on Base for pre-send EVM transaction simulation for AI agents. Returns an x402 v2 challenge and, after payment, a preflight result and proof receipt; never broadcasts the transaction. | 1 | $0.01 | 0.00% | $0 | 0 | BSE |
| ○ | Aegis | Delivery-verified trust scoring for x402 services. Before your agent pays an unknown endpoint, Aegis returns a 0-100 trust score built from continuous live probes — liveness, well-formed 402 challenge, and price honesty against the advertised amount — plus real paid delivery spot-checks that confirm the service actually returns what it charged for. Registry of 2,393 scored services, published with a daily tamper-evident hash chain. Free capability discovery at /discover and /market, no wallet needed; /trust and /verify are $0.01 via x402 (USDC on Base). Also offers take-rate routing: pay Aegis once at /route and it buys the best-trusted upstream for you with per-item failover and auth-then-capture, so you are not charged if nothing delivers. | 4 | $0.01 | 0.00% | $0.24 | 11 | BSE |
| ○ | Survival Colony — GitHub Opportunity Due-Diligence | Read-only GitHub issue due-diligence for autonomous agents: issue state, assignment and claim signals, open PR competition, repository freshness, and strict payment-provenance checks. x402 v2 USDC on Base. | 1 | $0.005 | 0.00% | $0 | 0 | BSE |
| ○ | Watchtower | Deterministic sanctions screening for AI agents across OFAC/UN/EU/UK lists; x402 USDC on Base, no signup. | 1 | $0.02 | 0.00% | $0.02 | 1 | BSE |
| ○ | AgentBiz | Three keyless pay-per-call services for AI agents on Base mainnet. Verify: signed attestations that a site was reachable, a file is unchanged, a TLS certificate says what it claims, or JSON matches a schema — each with an Ed25519 receipt a third party can check. Ledger: wallet reputation before transacting with a stranger, reporting honest low confidence for unseen wallets rather than a misleading zero. Memory: namespaced key-value and vector memory for stateless agents, with tenant isolation enforced at the query level. From $0.0002 per call in USDC via the Coinbase CDP facilitator. Every 402 carries full x402 v2 Bazaar discovery metadata including per-route input and output schemas. | 2 | $0.003 | 0.00% | $0 | 0 | BSE |
| ○ | token-risk | Static on-chain token/contract risk scanner (bytecode-only, safe): proxy/upgradeability, owner/mint/pause/blacklist/setFee selectors, Sourcify-verified source, honeypot heuristics. Deep tier adds contract-control analysis: owner()/admin readout, ownership-renounced?, EOA-vs-multisig owner, proxy implementation. USDC on Base via x402. | 2 | $0.01 | 0.00% | $0.17 | 6 | BSE |
| ○ | PulseFeed — x402 Trust & Safety Oracle | Verify any x402 endpoint before your agent pays: liveness, scam/anomaly scan (payTo hijack, bait-and-switch, honeypot), on-chain receiver verification and an open Trust Score. Continuous independent audit of the whole x402 ecosystem (~5k endpoints tracked). Paid: /trust $0.02, /trust/dataset $0.10, /data/full $1 (cross-domain x402+MCP dataset). Free: /verify, /status.json, /incidents (security disclosures with on-chain proof). | 3 | $0.004 | 0.00% | $2 | 5 | BSE |
| ○ | Payan Catalog Health Checker | 4-cent x402 health check: hit a PayanAgent catalog endpoint and get live 402/accepts/payTo/uptime evidence as JSON. USDC on Base. No signup. | 1 | $0.04 | 0.00% | $0.10 | 1 | BSE |
| ○ | LedgerProof Settlement Army | Pay-per-call evidence for autonomous agents, settled in USDC on Base via x402 — no account, no API key, no subscription. POST a subject with your current and required confidence, and the service assembles independently verifiable evidence and returns it with a free cryptographically anchored hash receipt carrying a verify_url anyone can check without trusting us. Settlement is proof-gated: payment is captured only after the deliverable passes a published acceptance rule that can genuinely fail, so a failed result is never charged for. Part of the LedgerProof Settlement Army, 21 proof-gated services in total. | 1 | $0.05 | 0.00% | $0 | 0 | BSE |
| ○ | fingers | The honest trust index for x402: check who you're paying before your agent pays. Free verdict gate, index, and profiles; deep report via x402. | 1 | $0.10 | 0.00% | $0 | 0 | BSE |
| ○ | Shopify CSV Catalog QA by UNLAV | Checks Shopify product CSV files before import and returns deterministic duplicate-SKU, missing-value, malformed-variant, and import-risk findings with row-level evidence. | 1 | $0.05 | 0.00% | $0 | 0 | BSE |
87 of 87 services ── category: Verification ── all services