x402 Data API

Groundcheck is verified enrichment for AI agents. Send a factual claim and it returns a machine verified verdict with a confidence score and cited sources, grounded against live web sources. Identity protocols verify who an agent is; Groundcheck verifies what it says. Single claim grounding is free. Paid endpoints over x402: claim extraction and instrument resolution at 0.005 USDC, document grounding at 0.02, and delivery attestation at 0.05, which returns a signed receipt binding the x402 payment to the delivered content, verifiable offline. v1 and v2 both accepted. No account and no API key.

Pay-per-call web tools for AI agents: Google web search, clean page reading as Markdown, and PDFs from Markdown or a URL. USDC on Base over x402, no account or API key; failed calls are not charged.

Scans recently launched token pools on Base, Ethereum and Arbitrum, returning pool age, liquidity, FDV and buy/sell activity. Lookback window and minimum liquidity are configurable per request.

Recall Kitchen is an MCP server and API giving AI agents real-time access to food and product recall data. Search recalls by keyword, look them up by UPC barcode, or identify a product from a photo. Tools: search_product_recalls, search_product_recalls_by_upc, search_product_recalls_from_image. Free API keys available, or pay per call with x402 at $0.025 USDC/call on Base.

SEO authority scores, keyword opportunities, competitor gaps, content briefs, site audits, and internal-link intelligence for agents. Paid per call via x402 USDC on Base.

Per-market liquidity authenticity + UMA resolution-risk for Polymarket prediction markets, sold to AI trading agents via x402 ($0.20/call, USDC on Base). Returns whether apparent volume is broad/organic or concentrated/manufactured (HHI, effective traders, book cross-check, on-chain counterparties) AND the UMA resolution-risk on two axes: how often a category disputes on UMA x when disputed, how often the result FLIPS the original proposal vs just confirms, plus whether the criterion is objective (checkable) or subjective. Dispute-rate and flip-rate often invert by category - a two-axis read no other tool gives. Fact/base-rate, never a wash verdict nor per-market prediction. Also two /market-authenticity/{conditionId} and /x402-authenticity/{payTo} parameterized endpoints (see /openapi.json).

Multi-protocol capability index for the agent web (UCP, ACP, AP2, TAP, MCP, A2A, x402, MPP, llms.txt, OpenAPI). Cached host lookups are free; live re-probe is $0.02 USDC on Base via x402 (or €29/mo for origin owners).

Outside-in checks for any domain: certificate details from CT logs plus a live HTTPS probe, DNS records with SPF/DMARC, registration expiry via RDAP, and a combined site-health call. $0.01 per check, $0.03 for the bundle. Also available as a remote MCP server at /mcp.

Hardware price intelligence for agents. Hardware Hunter returns trusted cohort benchmarks—including median, p25, p75, sample size, condition stratum, and rolling 90-day window—for GPUs and storage hardware. Queries cost $0.01 in USDC on Base through x402. If trusted data is unavailable, the response says so and costs nothing.

Pay-per-call utility endpoints for agents: QR code image generation (PNG/SVG), clean Markdown + links extraction from any public web page, and OpenGraph/Twitter/JSON-LD metadata extraction. USDC on Base and Solana, no account needed. Free discovery catalog at /x402 and /.well-known/x402, OpenAPI at /openapi.json.

Unblocking and fresh web data for AI agents: any URL as Markdown, screenshots, YouTube transcripts and comments, Google Maps and Amazon reviews, LinkedIn and Indeed jobs, Google News, web search, X replies. Pay per call in stablecoins with x402 or MPP; remote MCP server at /mcp.

Paid API with a single /report endpoint returning Gulf of Mexico federal offshore oil and gas lease reports built from public BOEM data, filterable by area code, lease status or lease number. $0.15 USDC per query on Base or Solana.

Hyperliquid smart-money intelligence, pay-per-request over x402 in USDC on Base AND Algorand. Whale positioning and entries/exits, open-interest and funding signals, notional flow with stealth accumulation, a squeeze radar scored 0-100, and AI market briefs. 24 endpoints from $0.001 to $0.99, no account and no API key. The Base 402 quotes both networks; the same catalog is also served under /algo/* priced in Algorand USDC (ASA 31566704, settled by the GoPlausible facilitator, fees sponsored). Free tier: aggregate stats and a market sample.

Reliability scoring for an agent's scheduled jobs and pipelines (health grade, lapse risk, ranked fixes), plus habit analytics. Deterministic, no LLM. Pay per call via x402 in USDC on Base, no account or API key. Also an MCP server: habitscore-mcp on npm, tech.mydev-tools/habitscore in the official MCP Registry.

Tiny paid web services for agents. Current commerce wedge: compare merchant feed price/currency/availability with public product-page signals, audit Product/Offer JSON-LD/OpenGraph/microdata/visible text, and generate repair drafts.

Pay-per-call GTM data API on Base: company and person enrichment, work and personal email lookup, phone and LinkedIn lookup, decision maker identification and ad intelligence. Origin hosted on AgentCash, which exposes Deepline tooling.

Romanian company data for AI agents (ONRC/ANAF): CUI lookup, company profile, financials, full report, CAEN benchmark, administrator lookup, KYB risk score 0-100, and B2B lead lists filtered by CAEN, county, turnover and employees. Pay per call in USDC on Base via x402, no account or API key.

DopamineDesk offers 94 live, billable x402 data products on Base USDC, including public storefront, research, developer, and agent-readiness tools. Every paid route has a public OpenAPI contract and an unpaid 402 challenge.

x402 Solana wallet intelligence for agents: wallet evidence, funding lineage, private-routing context, Pump.fun cohorts, mint preflight, coverage, freshness, and methodology metadata. Pay-per-request USDC; no API key. Listing is crawl/visibility only — aggregate attestation currently attestation_stale (since 2026-08-05); not a revenue or PMF claim.

Searches the public Facebook Ad Library by keyword, advertiser or page and returns the full ad creative: headline, body copy, CTA and destination link, media URLs, run dates and platform mix across Facebook, Instagram, Messenger and Threads. Also serves TikTok Top Ads by country.

Pay-per-call flight fare API on Base. A single paid endpoint returns price observations for an origin and destination route, a historical median comparison, and a buy or wait recommendation. Fare data comes from the Travelpayouts provider. $0.10 per query.