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Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readiness, which wallets a… (3 paid endpoints on x402-doctor.onrender.com.)

By-the-minute Hyperliquid market-data archive, paid per request via x402 (no signup, no API key). Serves history Hyperliquid exposes no endpoint for (open interest and funding over time, HIP-3 perps (equities, commodities, FX; e.g. xyz:AAPL, xyz:SP500) and HIP-4 outcome markets), alongside OHLCV candles, raw trades, forced liquidations, and a survivorship-bias-free listings/delistings log. Free discovery endpoints; paid data answers HTTP 402 until you pay sub-cent USDC on Base or Hyperliquid HyperCore.

Offline structural validator for an Indian CIN (Corporate Identity Number, 21 characters). Parses and checks: listing status letter (L/U), 5-digit NIC industry code, 2-letter state code (against the known MCA state-code list), 4-digit inco… (28 paid endpoints on toll402.dev.)

Autonomous multi-worker A2A agent specialized in zero-cost file pre-processing, deterministic media/document parsing, parallel web scraping, automatic subtitles, and Gemini AI Python execution. Delivers real output files to public Supabase storage. Compatible with A2A Protocol v1.0 (and v0.3 via compatibility mode).

FirstKey MCP: agent wallets, free cycles faucet, and one-command site deploys on ICP.

B2B SaaS competitor pricing changes, strategic moves, market landscapes, reports and comparisons.

Commission a multi-model AI spec committee from your agent; get rubric-scored, build-ready specs.

German gross-to-net monthly estimate: Lohnsteuer, Solidaritaetszuschlag, Kirchensteuer, social contributions (2 paid endpoints on automaton.72.62.51.224.sslip.io.)

On-chain facts for any Base address: EOA or contract, first transaction and age, transaction count, ETH and USDC balances, top 10 tokens held with USD value when known, recent contracts created. Information, not investment advice. (4 paid endpoints on audit-site-web.pga-agent.fr.)

Agent document workspace with wallet auth. Create, update and share markdown docs. By AutEng.ai

A social venue for AI agents: rooms, conversations humans can watch, drinks that teach skills.

The CoinMarketCap for AI Agents. Directory tracking the agentic AI ecosystem: agents, MCP servers, tools, and frameworks with real-time health monitoring.

Deterministic HS6/TARIC customs resolution engine and bilingual FTS5 nomenclature API (UNE Node 04).

Gantt chart SaaS with server-side critical path and dependency-aware shift-impact tools, plus CRUD.

Stock trading signals, commodity risk scores, sector radar, market risk index. Free tier.

Brazilian fixed income (CDB, LCI, LCA, CRI, CRA, Tesouro) ranked by net-of-tax and real return.

SEO agent: GSC, keyword, backlink and AI-visibility insights, plus approval-gated site actions

Live ski snow, multi-model forecasts, powder rankings & a grounded Answer Engine for 500+ resorts.

Tracea — legal identity (Know Your Agent) for AI agents, on-chain. ERC-8004 compatible.

Official 100Hires MCP: AI ATS & Recruitment Software for candidates, jobs, applications, interviews.

Provide a simple API interface to search and filter 12306 train tickets, including direct, transfer, and stopover queries. Enable large language models to access real-time 12306 ticket information efficiently. Enhance user experience by integrating comprehensive train ticket search capabilities.

Search/download 7,000+ PBR materials, HDRIs, decals, 3D assets; generate PBR materials and HDRIs.

Structural address check: country, street, city, and postal pattern for common countries (TR, US, GB, DE, FR, NL, …). Returns a normalised single-line form and named issues. Not proof of deliverability. (111 paid endpoints on 402.com.tr.)

Website uptime and change check: is this URL up right now, and has the page changed? Fetches the URL and returns the HTTP status, Last-Modified and ETag headers, a SHA-256 fingerprint of the content, and whether it changed versus a hash yo… (5 paid endpoints on 402oracle.com.)

Publish a listing on 402post, the classifieds board for AI agents: $0.03 USDC for 30 days. POST the listing as JSON; a bad one gets a free 422 with every error, a good one gets this 402. Dry run: POST /v1/posts/validate. Batch: {"listings"… (3 paid endpoints on 402post.com.)

Payment integration check for 0.001 USDC; no external data lookup. Returns time, rail, network mode and free/paid capabilities. HTTP payment options can include Base, Polygon, Arbitrum and XDC; the challenge lists currently available netwo… (3 paid endpoints on api.402rates.com.)

Convert a time between any two IANA time zones (DST-aware). Pay-per-call in USDC on Base.

Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and filtered to a requested… (3 paid endpoints on 4yearcycle.com.)

Get real-time spot price and market data for a cryptocurrency

Formally verified AI safety APIs. Pay-per-call via USDC (x402). 75+ endpoints, no signup.