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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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2,776 results
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- 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
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 - 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 - Xx402.presenceoperations.comOther services
What it would cost to execute a given notional in a given market right now: size-weighted fill price, slippage from the touch in basis points, and whether the visible book can absorb the size at all.
Basex402.presenceoperations.comfrom $0.00482 endpoints - SStelar DigitalSocial & people
Sentiment score (-1 bearish to +1 bullish) and label for arbitrary text, or for a crypto asset based on its recent price action, via Claude Haiku. For agents gauging market mood or scoring news, social posts, or free text.
BaseSolanaapi.stelardigital.comfrom $0.0054 endpoints - SStableProductsOther services
List Wirecutter review URLs from the public Wirecutter review sitemaps. Defaults to recommendation-like review pages.
Basestableproduct.devfrom $0.014 endpoints - Rrisk-api-production-af85.up.railway.appOther services
Verify any Base transaction by hash. Returns validity, from, to, block, gas used.
Baserisk-api-production-af85.up.railway.appfrom $0.019 endpoints - WW SystemOther services
One-call KYB check of an EU company: VIES VAT validation + official business register + EU/UN/OFAC/UK sanctions screening -> pass/review/fail verdict ($0.045 per company)
Baseapi.wsystem.devfrom $0.0114 endpoints
AxonGateCrypto & DeFiScan untrusted text (a web page, email, tool output or document) for prompt-injection and agent-hijacking patterns before it reaches an LLM. Returns a risk level, score, findings with offsets and a sanitized copy. Deterministic, sub-50ms.
BasePolygonArbitrumapi.axongate.onefrom $0.0029 endpoints- AAmazon product detail by ASINImages, audio & video
Amazon product detail API (US) by ASIN - Amazon product data for one ASIN: title, product URL, image, price range, discount, currency, star rating, review count, category path, availability and description. Amazon prices and product-detail lookup. Unknown ASIN returns found=false.
Baseproducts.openverbs.comfrom $0.0064 endpoints
Laso FinanceCrypto & DeFiGet a Firebase ID token for authenticating with the callable APIs
BaseSolanax402endpoint-utiwoa54hq-uc.a.run.appfrom $0.0011 endpoint- Qqr-api-production-1836.up.railway.appOther services
Generate a QR code PNG (returned base64-encoded in JSON) for any text or URL using default black-on-white styling.
Baseqr-api-production-1836.up.railway.appfrom $0.0014 endpoints - UUK Company LookupSocial & people
UK company profile from the Companies House public register, returned as JSON.
Basepennydatahq.comfrom $0.0019 endpoints
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.