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Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
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4,372 results- PPeyon x402 endpoint checkerCrypto & DeFi
Checks any x402 endpoint's unpaid 402 response: x402 version, accepted scheme, network, asset (is it USDC), price, payTo, https resource url, description, and Bazaar discovery metadata validated against its schema. Makes no payment.
Basepeyon.aifrom $0.0114 endpoints - RRacingPulseSocial & people
Statistically-backed racing angles — trainer/jockey combos and trends. For horse-racing betting agents.
BaseSolanaPolygon+8racingpulse.theaslangroupllc.comfrom $0.0213 endpoints - AagentdatafeedSocial & people
Security advisories: Known exploited vulnerabilities (CISA KEV) enriched with daily FIRST EPSS exploit probability. Use when a user asks whether a CVE is actively exploited, which vulnerabilities in a vendor or product to patch first, whether it is used in ransomware campaigns, or needs CISA KEV due dates, required actions and FIRST EPSS exploit probability in one call.
Baseagentdatafeed.comfrom $0.0035 endpoints - Sscout.hugen.tokyoCrypto & DeFi
Search Stack Overflow for developer Q&A, solutions, and best practices. AI agent API for technical knowledge retrieval. Accepts USDC payments on Base and Solana
BaseSolanascout.hugen.tokyofrom $0.0111 endpoints - CContextSlimAI & agents
[MCP: fetch_result] Targeted JSONPath extraction (query param mode) from cached context reference.
Basecontextslim.friczero.comfrom $0.0012 endpoints
x402 Spend Cap/Allowance CheckCrypto & DeFiCheck an agent wallet's x402 spend cap before it pays, via Liquid Logic X: send a wallet and optional endpoint URL, get allowed, reason, remainingUsdc, capUsdc, spentUsdc from the published policy. $0.001 USDC on Base.
Baseaudit.liquidlogicx.comfrom $0.0016 endpoints- LLegalPulseSocial & people
Trademark knock-out check with live official verification: name in, conflict risk verdict out. Candidate conflicting marks are looked up in the USPTO TSDR system in real time and returned as verbatim official records (LIVE/DEAD status, owner, classes, dates) — research leads that could not be officially verified are labeled as such. US federal register; names the right register for non-US markets.
BaseSolanaPolygon+8legalpulse.theaslangroupllc.comfrom $0.0814 endpoints - Aanomaly.forgemesh.ioCrypto & DeFi
Returns a real-time mempool anomaly score with current gas price vs 20-block median, pending whale swaps, and contract deploy counts. Poll every 5s to monitor mempool for MEV or sandwich attacks and catch gas spikes or large pending swaps as they happen, before they land on-chain.
Baseanomaly.forgemesh.iofrom $0.014 endpoints - AAIS FleetData & research
Get the vessels currently in a UN/LOCODE port as JSON: MMSI, name and arrival time of every vessel the AIS Fleet network observes there now, with a total count.
Baseaisfleet.comfrom $0.0113 endpoints - Wwindtrapdata.devSearch & web
x402 endpoint validator, uptime probe, and crawled directory index of working x402 Bazaar APIs ($0.001 USDC) — Audits HTTP 402 PAYMENT-REQUIRED headers and returns verified working x402 services.
Basewindtrapdata.devfrom $0.0015 endpoints - AAgentic ReservationsSearch & web
Restaurant recommendations from the Blackbird network (~2,000 curated restaurants, mostly NYC and San Francisco). Full-text search plus city/neighborhood filters, with complete specials on every result, refreshed daily from a cache (never a live call) — e.g. every West Village restaurant with its current Fly-reward offers in one call.
BaseSolanaagentres.devfrom $0.014 endpoints
x402 DoctorAI & agentsShould my agent pay this expensive x402 endpoint? Call it before a costly or repeated payment. Returns the go / caution / no_go verdict plus the full diagnosis, the endpoint's check history per day over 30 days, how reliable the seller's other endpoints are and whether the endpoint moved domains. Never pays the endpoint. Bulk: 1000 credits for $0.80 via /api/v1/credits.
SolanaBasexrpl+4x402-doctor.fizzl.eufrom $0.0016 endpoints- Rrng.sociologic.aiCrypto & DeFi
Generate cryptographically secure random float(s) between 0 and 1
Baserng.sociologic.aifrom $0.014 endpoints - Xx402-trends-server.onrender.comCrypto & DeFi
Get live cryptocurrency price and market data from Coinbase Exchange for BTC, ETH, SOL, and other supported trading pairs. Use this crypto market API for last price, best bid and ask, 24-hour open/high/low/volume, and 30-day volume. Defaults to BTC-USD.
Basex402-trends-server.onrender.comfrom $0.0054 endpoints - BBitcoin NetworkDeveloper tools
Bitcoin network health: tip height, block pace vs 10 minutes, difficulty retarget forecast, hashrate trend and Lightning size.
BaseSolanaPolygon+1bitcoin-network.x402tookit.comfrom $0.028 endpoints - BBicycle Gearing & Fit CalcCrypto & DeFi
Cadence needed to hold a target speed in a given gear, and the chainring-to-cog ratio needed for a speed at a cadence.
BaseSolanaPolygon+1bike-calc.x402tookit.comfrom $0.028 endpoints
Magneta Contract RiskCrypto & DeFiSmart contract security and token risk check before you trade, approve, bridge or integrate: deterministic 0-100 risk score for any deployed contract on 20 EVM chains. Flags rug-pull levers (owner mint, blacklist, pause, adjustable fees, upgradeable proxy, ownership not renounced), SELFDESTRUCT/DELEGATECALL, verified source and aderyn static analysis. Read-only. Errors (400 bad input, 422 not a co
BaseSolanax402.magneta.financefrom $0.012 endpoints
GetDigitalCraftSocial & peopleStablecoin circulating supply and peg status across 400+ pegged assets, ranked by size
Basex402render-u5vwpxpyua-uc.a.run.appfrom $0.0069 endpoints- KKitchen Pass Chef APIOther services
Scale a recipe from 4 to 50 servings (serves), double or halve it, with head chef Cristopher's verified rules. Each line says why: straight maths, fixed ratio (garlic, onion, ginger, thickeners) or start low and taste up (salt in a soup), plus scaling-up tips: roasting, frying, stir-fry, braises, cakes, bread. Units: g, kg, ml, l, tsp, tbsp, lb, oz, cups. Refused, never guessed: allergen-free, cur
Basekitchen-pass.netlify.appfrom $0.018 endpoints - Rrealdep-packageCrypto & DeFi
Verify a package: does it exist, is it deprecated or yanked, and does it have known vulnerabilities? Checked against the npm/PyPI/crates.io registry plus OSV.dev advisories.
Basegoodsong.devfrom $0.0054 endpoints - Ggardenpatch.xyzImages, audio & video
Calendar invite (.ics) — Build an RFC 5545 calendar event file (.ics) any calendar app imports. Nothing is sent and no calendar is written. $0.01 per call.
Basegardenpatch.xyzfrom $0.0113 endpoints - CCrypto Perp Funding & SentimentCrypto & DeFi
Supported perpetual-futures trading pairs — the list of symbols (BTCUSDT, ETHUSDT, …) the funding-rate scanner and signals cover, as a clean snake_case envelope.
BasePolygonArbitrum+1perpsignals.use.x402atlas.comfrom $0.0053 endpoints - Xx402 Chain ToolsCrypto & DeFi
Check the latest or current Base Mainnet block number. Use this to get the live Base block height.
BaseSolanablockchain-api.x402-chain-tools.workers.devfrom $0.0014 endpoints - Xx402stock.vercel.appMarkets & finance
Full-text search across every SEC EDGAR filing since 2001. Find filings mentioning a keyword or exact phrase via ?q=, narrow by ?forms=10-K,8-K, ?ticker=, and ?startdt=/?enddt= dates, and cap with ?limit=. Returns each match's form, filer, date, and a link to the document. Sourced from SEC EDGAR. From x402stock, a market & economic data API (x402, USDC).
Basex402stock.vercel.appfrom $0.015 endpoints - Ooraclepost.higgsfield.appCrypto & DeFi
The chain clock on Base: latest block number and its timestamp, plus the node's current time and the lag between them. No parameters. No third-party API, no cache.
Baseoraclepost.higgsfield.appfrom $0.0014 endpoints - Ccryptodataapi.comCrypto & DeFi
Dated crypto catalysts (unlocks, mints, listings, macro) with a long/short bias and 0-1 magnitude each.
Basecryptodataapi.comfrom $0.0087 endpoints - Ssec-filings.mick8511.workers.devSocial & people
SEC company lookup: resolve a stock ticker, CIK number or company name to the SEC registrant profile with CIK, legal name, tickers, exchanges, SIC industry code and description, state of incorporation, business address, fiscal year end, filer category and former names, from SEC EDGAR. Free sample: https://sec-filings.mick8511.workers.dev/sample
Basesec-filings.mick8511.workers.devfrom $0.0025 endpoints - LLand Survey ScreeningOther services
Great-circle distance (miles, km, feet, nautical miles) and initial compass bearing between two latitude/longitude points.
BaseSolanaPolygon+1land-survey.x402tookit.comfrom $0.028 endpoints - GGrades & Study CalcOther services
Score needed on a final exam (or any remaining work) to reach a target class grade, from current grade and its weight.
BaseSolanaPolygon+1grades-calc.x402tookit.comfrom $0.028 endpoints - AApiToll Base Gas OracleAI & agents
Base gas oracle / gas price API for AI agents and bots — get the gas price for a transaction on Base in one x402 call. Real-time slow/standard/fast EIP-1559 fee tiers from a live eth_feeHistory call, returned as DROP-IN maxFeePerGas + maxPriorityFeePerGas in wei — plug straight into a viem/ethers transaction, no gwei conversion. Plus base fee, head block, and network fullness. Call it before every
Basegas.apitoll.cloudfrom $0.0011 endpoint
Service data comes from the Coinbase CDP and PayAI discovery lists and refreshes every few hours. Usage is paid calls over the last 30 days. APIs launched here are verified by us; the rest are paid directly to their owners.