x402 Data API

Analytics API for the x402 ecosystem. Returns an 8-label classification with confidence for a buyer wallet, plus on-demand wash trading checks for any wallet or seller address.

Pay-per-call APIs using USDC on Base. Fetch ($0.005 per completed request) turns public static HTML into bounded Markdown with source URLs, retrieval time and content hash. Optional section_id selects one named section; quality.section labels its scope. Supports bounded simple merged tables; no JavaScript, login, PDF, paywall or CAPTCHA bypass. Unsupported content fails before settlement. The catalog also includes prospect qualification and batches, listing formatting, ad/page checks, English creative OCR, campaign-link checks, email HTML preflight and on-demand offer comparisons. These are bounded evidence-based aids, not conversion, deliverability or compliance guarantees. Current schemas and limitations: https://signalforgestudios.com/x402/openapi.json

3 APIs brasileiras pagas via x402 (Base mainnet, USDC): verificação de CNPJ (situação cadastral e Simples Nacional), validação de CEP/endereço, e taxas oficiais do Banco Central (Selic, CDI, dólar comercial) — dado público brasileiro agregado, pronto pra um agente de IA consumir numa chamada só.

98 pay-per-call data APIs behind x402 on Base. Company registry lookups and enrichment, sanctions and litigation screening, real-estate and job listings across 15 countries, SEC/EDGAR and funding trackers, crypto wallet and token analytics, plus web utilities (URL to markdown, structured extraction, domain and email checks). Every endpoint is a single POST returning JSON, priced 0.01-0.15 USDC. The same catalogue is also exposed as 9 MCP bundles over streamable-http at /mcp/{bundle}.

Up to 10 organic Google search results with ranking, URL, title and description. Live data, pay per call in USDC on Base via x402. REST and MCP. No buyer account or API key required.

66 pay-per-call HTTP APIs for AI agents over x402 (USDC on Base, no signup, no API keys): web scraping and JS-rendered page-to-markdown, web search, isolated code sandbox, LLM ask/classify/summarize, crypto and DeFi market data (spot, candles, order books, funding rates, yields, TVL, stablecoins), prediction-market odds, news and sentiment, plus agent utilities (KV memory, verifiable randomness, webhooks, notary, metered upstream gateways).

Machine-payable Korea field-ops preflight, building execution readiness and Thailand-Myanmar Mae Sot/Myawaddy shipment decision APIs over x402.

Machine-payable Solana intelligence over x402 v2: heuristic token risk (mint/freeze authority, Token-2022 dangerous extensions, holder concentration), wallet activity profiles, one-call token intel bundle and a pre-trade sweep skill-pack, plus raw mainnet state (priority-fee distribution, tx decoding, Jito tip-floor, epoch, Kamino markets). Verdict-free by doctrine: responses report 'unknown' over guessing and cite the RPC method behind every field. Settlements are written to a SHA-256-chained ledger verifiable client-side (WebCrypto) and the machine-readable surfaces are Ed25519-signed. USDC on Solana mainnet, self-hosted facilitator, no API key.

Risk profile for tokenized real world asset vaults on Base, covering admin and freeze controls, contract upgradeability, and secondary market exit liquidity across 14 vaults.

359 pay-per-call HTTP tools for AI agents on one host: web search and page extraction, cited answers, crypto and DeFi market data, on-chain analysis and contract risk, security and breach checks, US government and regulatory records, and enrichment. No account and no API key - an unpaid request returns an HTTP 402 quote, pay with an X-PAYMENT header and the call is served. USDC on Base; the same catalog is also served over Solana on payai.agentstools.dev.

Pay-per-request API server built on the x402 protocol. 21 routes priced in USDC from $0.001 to $0.05 per call, with no accounts, API keys or subscriptions. Covers Polymarket and Kalshi prediction markets plus a cross-market odds-gap finder, DeFi TVL, crypto prices and trending coins, Exa web search, multi-chain reads (read-only RPC, wallet balances, gas prices, ENS), live weather, AI text generation, and a document indexer that returns exact text spans with SHA-256 fingerprints.

Pay-per-call API returning crypto market microstructure and risk metrics as JSON (VPIN, Kyle lambda, Roll spread, CVD, Amihud illiquidity, gamma exposure), paid per request in USDC on Base with no API key. Standard metrics $0.05, market summary $0.25.

Returns the current position of a tracked freight load from its load number, including coordinates, timestamp and transit status. Single POST endpoint by SuVerse Labs, priced at $0.01 per call in USDC on Base and Solana.

Crinkl provides real-time, verified, identity-free commerce signals from U.S. consumers who are rewarded in Bitcoin for purchase participation. Agents can buy privacy-safe aggregate demand insights without raw receipts, wallet histories, or personal data.

Construction data for the Rio Grande Valley in South Texas (McAllen, Edinburg, Mission, Pharr, Brownsville, Harlingen and four more cities). Send a city and get permits, housing supply, home values, building-material prices, the mortgage rate and labor conditions, each value dated with its age. Other calls return registered commercial projects with owner, estimated cost and square footage, the projects filed near an address, the Hidalgo County parcel record for an address, cost per square foot by building type, a company's project history, and weekly and monthly series. Prices run from $0.01 to $0.25 per call. Bad input gets a free 400 and an empty answer gets a 404, so neither is charged. Built by a Valley builder; the newsletter edition comes out weekly in English and Spanish.

Vehicle Intelligence for AI agents. Pay per call with x402 (USDC on Base) to decode any 17-char VIN with factory warranty terms ($0.01), read merged US (NHTSA) + Canada (Transport Canada) recalls ($0.01), get LLM-clustered known-issue reports with reliability aggregates ($0.05), and itemized used-car closing costs for all of Canada + 50 US states ($0.02). Free /v1/sample/* endpoints return every response shape. Informational data only — not a vehicle-history report.

Budget-capped x402 tools for AI agents: session_create enforces a hard spend cap with receipts; verified_route vets x402 providers by real usage; pre_trade_check is a one-call pre-trade safety verdict. 17 free crypto/market-data tools alongside. USDC on Base (standard x402) and Stellar via SDK.

Weekly curated arXiv shortlist with disruptiveness scores and structured JSON for AI agents. Humans read explainers free. Agents pay USDC on Base via x402 for papers ($0.01), articles ($0.02), scores ($0.005), feed ($0.05), and the week bundle ($0.25). Catalog and current week are free.

Crypto derivatives market data from Laevitas: options, perpetuals and futures catalogs, OHLCV, open interest, volatility, gamma exposure and liquidations, paid per request in USDC on Base or Solana as an alternative to an API key.

Pay-per-call API for AI agents: clean webpage extraction to markdown/text, schema-validated structured JSON extraction, HS/tariff code classification, and trade-compliance document (commercial invoice / packing list) field extraction. Priced per call in USDC via x402 -- no accounts or API keys required.

Pay-per-call data API serving many endpoints on one host: weather and forecasts, earthquakes, flood and marine conditions, fiat exchange rates and conversion, on-chain address risk, plus alert and invoice workflows. No accounts or API keys, USDC micropayments on Base.

Live telemetry from a paper-trading research lab running 780+ bots across Kalshi, Polymarket, crypto and equities: leaderboard, signals, alerts, calibration, cross-venue divergences, exposure crowding, optimizer status. Every response carries stale/sample honesty flags. $0.01-$0.02 USDC per request on Solana mainnet. Not investment advice.

Pay-per-call API for UK property data by postcode: Land Registry sold prices, rental yield estimates, stamp duty, EPC ratings, crime statistics, flood risk, planning applications and council tax. Priced at $0.001 per call in USDC on Base.