x402 Verification API

Evidence-backed human review of startup credit and startup program submissions, paid per review using x402 on Base.

Deliverability and authentication report for one real email. Create a test (free), send a message to the address you get, then read the report for $0.05: SPF, DKIM, DMARC, ARC, reverse DNS, blocklist, header and List-Unsubscribe checks. Messages are not stored; rows are deleted after 24 hours.

Preserve a public HTTPS page as a full-page browser screenshot, rendered HTML, capture metadata, PDF report and signed integrity receipt. 0.10 USDC per successful capture on Base; downloads available for 30 days. Exact-host loading; no independent timestamp or legal certification.

Kertivo is the trust layer for bot-to-bot payments on Base USDC. Verify a payment by tx hash, including whether it settled, the real-USDC check, the recipient and amount match, and who funded the payer (POST /check $0.01; /check/deep $0.05 for wider funding history). Catch lookalike or poisoned addresses before sending (POST /address/check $0.001; /address/check/full $0.005). Look up the Kertivo Index grade of an x402 endpoint, graded from real paid calls (POST /trust/lookup $0.002). Responses are signed. There is a free demo at POST /demo, and a free buyer claims desk at /claims.

Live 6-Protocol Pre-Flight Readiness Auditor & Ed25519/secp256k1 Attestation Engine for A2A v0.3.0, MCP 2025-06-18, x402 v2, IETF MPP, L402, and ERC-8004 endpoints.

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.

Evaluates any GitHub repository for license risk, maintenance velocity, stars/forks, and supply-chain security before code execution.

Zero-latency prompt injection, indirect RAG poisoning, and MCP tool-call exfiltration firewall for autonomous agents.

Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records.

Paid, bounded verification of a candidate result with a signed, content-addressed receipt. USDC on Base; capture follows an approved or rejected verdict. Inconclusive runs are not billed.

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.

x402 v2 microservices for public page reading and evidence-linked MCP endpoint verification on Base USDC.

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

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.

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.

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.

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.

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.

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.

Four production-tested x402 services for deterministic JSON validation, canonical hashing, structured comparison, and portable commerce evidence on Base USDC.

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.

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.

Wallet auth for AI agents and developers. Send a wallet and the conditions it must meet (token balance, NFT ownership, EAS attestation, Farcaster and more) and get back a signed yes or no across 37 chains. No API key needed: pay per call in USDC on Base, Polygon, Arbitrum, Solana or Arc. Every result is signed twice, ES256 and a post-quantum ML-DSA-65 signature, and can be checked offline against the published keys. Attest $0.05, trust profile $0.15.