Explore APIs
Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
- Projects
- 4.4K
- Paid endpoints
- 87K
- Paid calls · 30 days
- 885K
- Launched here
- 0
All projects
729 results- Xx402 FunSearch & web
A fortune cookie: one short, upbeat fortune (80 written for this service) and six lucky numbers from 1 to 49. Give a seed for a repeatable draw.
Basefun.kagurazaka.devfrom $0.0017 endpoints - HHyperliquid Smart Money Data APICrypto & DeFi
Hyperliquid perps (perpetual futures). What history exists before you pay for it: how many markets we track, which asset classes, and the range covered. The cheap probe that tells an agent whether the paid series is worth buying
SolanaBaseArbitrum+2whaletape.xyzfrom $0.015 endpoints - Aagentworld.meSocial & people
AgentWorld Agent Leaderboard - top AI agents ranked by USDC wealth or reputation score. Includes job role, city, mood, personality archetype. Updated every 3 minutes by the tick engine. Filter by city or job.
BaseEthereumArbitrum+3agentworld.mefrom $0.0012 endpoints - Ccontent.hugen.tokyoCrypto & DeFi
Extract and classify all hyperlinks from a web page — internal vs external using eTLD+1 domain matching. Returns up to 200 internal and 200 external links with counts. No web crawler setup needed. Accepts USDC payments on Base and Solana
BaseSolanacontent.hugen.tokyofrom $0.011 endpoint - Xxhagents.xyzImages, audio & video
One 0-100 safety score for a Base token before an agent buys: liquidity, top-10 holder concentration, owner powers in the bytecode, upgradeability (EIP-1967), explorer/Sourcify verification, creator history, small-trade price impact. Verdicts: safe/caution/danger per component, unknown when a check could not run, and not_a_token with no score when the address deploys no code.
Basexhagents.xyzfrom $0.0328 endpoints - BbasedueCrypto & DeFi
Public holiday and business-day calendar for US and UK: is a date a business day, add N business days, count business days between dates (net of holidays), and list a year's holidays. $0.01 per call in USDC on Base via x402.
Baseapi.firstmention.ukfrom $0.0127 endpoints
SorenCrypto & DeFiRead current gas price and base fee, live from Base mainnet, for a fraction of a cent. No API key, no account — a wallet is the only requirement, and you are charged only if the read succeeds. Plain unsigned data; the attested version of chain reads is /v1/oracle/onchain. Answers are read at the moment of the call and stamped with the block they came from where applicable.
Basesoren.comfrom $0.00216 endpoints
CRA AGENT dataImages, audio & videoA short plain-text summary of one Wikipedia article, with its image and last update. Content is CC BY-SA 4.0.
SolanaBaseEVM chain 5042+10api.cra-agent.techfrom $0.000520 endpoints- HHyperliquid Market DataCrypto & DeFi
Current mid price for every Hyperliquid asset (perps + spot) in one call — a fast whole-venue price snapshot.
BasePolygonArbitrum+1hyperliquid.use.x402atlas.comfrom $0.0059 endpoints - PPerp Gap APICrypto & DeFi
Use first to see which venues list a ticker and get the exact symbol before /quote, /funding or /gaps. Every stock perp and tokenized stock agents can trade: trade.xyz, Aster, Lighter and OKX perps plus xStocks and Ondo tokens (2,400+ markets), with venue, symbol or mint, underlying, type, live and tradable-now flags. Same data free at GET /catalog. Errors: 400 unknown venue, 402, 502. Data, not a
BaseSolanaperp-gap-api.perpgap.workers.devfrom $0.00112 endpoints - AAgent Kalender HubAI & agents
Deutschland auf Bundeslandebene inklusive der Gemeinde-Sonderfälle, Österreich auf Bundeslandebene, die Schweiz auf Kantonsebene. Bewegliche Feste werden aus dem Osterdatum gerechnet, nicht aus einer Tabelle gelesen.
Basekalender.halowerk.comfrom $0.0011 endpoint
Artillerist Wallet TestCrypto & DeFiVerify that an agent wallet can complete an x402 v2 payment using USDC on Base mainnet before purchasing production art data.
Basetheartillerist.comfrom $0.0018 endpoints- VVerdict 402Crypto & DeFi
Semantic content moderation, not a word list: profanity (even disguised, any language), harassment, hate, sexual content, threats, self-harm, scams. Per-category scores, allow/review/block, configurable ignore list.
Baseverdict.kechlab.comfrom $0.008824 endpoints - 4402rates.comCrypto & DeFi
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 networks for each transport. The receipt identifies the paid network and transaction. Business/professional use only. Terms: https://402rates.com/data-terms/
BasePolygonArbitrum+1api.402rates.comfrom $0.0014 endpoints - DDNS A Record LookupSocial & people
DNS A record lookup — resolve any hostname or domain to its IPv4 addresses, returned as a clean JSON list. For host resolution, connectivity and uptime checks, IP-reputation enrichment and infrastructure mapping.
BasePolygonArbitrum+1dns.use.x402atlas.comfrom $0.0057 endpoints - Nnotary.forgemesh.ioCrypto & DeFi
Notarize AI output: a signed Ed25519 attestation of the model response plus sha256 content hash, receipt token, and Merkle anchor status for one AI inference — a cryptographic receipt for inference that lets you prove an AI said X and verify model output authenticity, checkable free by anyone, anytime.
Basenotary.forgemesh.iofrom $0.0014 endpoints - GgankdatSocial & people
UK procurement notices. Public procurement notices from the official Find a Tender OCDS feed, flattened to one queryable schema. Blind Mode: no contact or personal data. One call returns one page of matching records as JSON (25 by default, per_page up to 100) with the total count and the last refresh time; the query parameters filter the records.
Basegankdat.comfrom $0.00516 endpoints
AgentForgeCrypto & DeFiPayment flow verification for agents integrating x402: confirms your wallet and payment channel work before you spend on a real endpoint. Category: infra.
BaseSolanaagentforge-taupe.vercel.appfrom $0.00119 endpoints- Jjoyful-charm-production-bf6d.up.railway.appMarkets & finance
Aggregate insider-trading market statistics: total Form 4 trades tracked, trades in the last 24h, top 20 most-traded tickers and top 20 most-active insiders by filing count and dollar volume. A one-call overview of where insider activity is concentrated right now. Returns JSON.
Basejoyful-charm-production-bf6d.up.railway.appfrom $0.0015 endpoints - JJMT WHOIS RDAPSearch & web
Raw RDAP registration record for a domain, returned as structured JSON.
Basejmt-x402-proxy.jmthomasofficial.workers.devfrom $0.0026 endpoints
x402 Agent HubSocial & peopleStatus of any transaction on 7 EVM chains: pending / success / reverted, confirmations, block time, from/to, value and the all-in fee (including the OP-stack L1 data fee on Base and Optimism). Use it to confirm a payment or deployment landed. You only pay for successful reads: invalid input, not-found and upstream errors cancel settlement.
Basex402-agent-hub.x402-agent-hub.workers.devfrom $0.00225 endpoints- BBraille to textImages, audio & video
Break a braille string into its cells and the raised-dot numbers (1–8) of each cell.
Basebraille.openverbs.comfrom $0.0024 endpoints
RobinXSocial & peopleProven X caller-lift leaderboard
Baseapi.robinx.iofrom $0.019 endpoints
Chain IS ContractCrypto & DeFiIs a Base address a smart contract or an EOA? Returns is_contract and bytecode size. Use when an agent must decide whether a recipient is a contract before sending funds or approving it.
Basex402-data-api.sigrunner.workers.devfrom $0.00146 endpoints
Postcode ContextSocial & peopleGET /api/v1/postcode/:postcode - Single Postcode Socio-Economic Profile (ONS Census 2021 demographics, IMD deciles, Land Registry prices, GBP/sqm, EPC ratings, broadband speeds)
Baseapi.postcodecontext.ukfrom $0.0054 endpoints- CCoinCapAI & agents
Full asset data for one or more slugs (agent-optimized).
Baserest.coincap.iofrom $0.00211 endpoints
SpendTheBitsCrypto & DeFiOfficial $0.01 proof-of-life resource for SpendTheBits x402: returns a JSON heartbeat. Pay it to verify your agent's x402 client end to end.
BaseEVM chain 5042Polygon+1x402.spendthebits.comfrom $0.0039 endpoints
Gas PriceCrypto & DeFiGas price: live gas fees for Ethereum, Base, Arbitrum, Polygon and Solana in one call. Use before sending a transaction to pick a fee or the cheapest chain. Returns base fee, slow/standard/fast priority fees, max fee, congestion, and the USD cost of a transfer, an ERC-20 transfer and a swap per chain, plus Solana priority fees. Optional chain. 0.001 USDC/call; failed calls are free.
BasePolygonArbitrum+3x402-seller-pmlm.onrender.comfrom $0.00115 endpoints
WeatherDeveloper toolsWeather forecast for a location (global, keyless): current conditions, an hourly series (up to 48h) and a daily summary (up to 10 days: min/max temp + condition), from met.no. Pass lat+lon, or a place name. For travel, logistics, events, energy. No API key.
Baseweather.cyberwarex.comfrom $0.0012 endpoints- VVALUNARIA BUS-WEBData & research
VALUNARIA Evidence Fast
Basex402.valunaria.comfrom $0.015 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.