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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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Crypto & DeFi
1,108 results- 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
Mycelium FinanceCrypto & DeFiMycelium Market Snapshot — live Mycelium Strategy liquidity allocation plus Solana top-performing tokens, in one JSON call. MYC reward: the first payment from a Solana wallet also sends 1337 MYC to the paying wallet (one reward per wallet).
Solanamyceliumfinance.comfrom $0.051 endpoint
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
Laso FinanceCrypto & DeFiGet a Firebase ID token for authenticating with the callable APIs
BaseSolanax402endpoint-utiwoa54hq-uc.a.run.appfrom $0.0011 endpoint- VVatic prediction dataCrypto & DeFi
Live, exact crowd probabilities of up to 100 open Vatic prediction markets (football, fights, politics, finance, crypto and more).
Base Sepoliavaticmarkets.iofrom $0.0027 endpoints - Zzoll.halowerk.comCrypto & DeFi
Matches declared classification tokens against a supplied published dual-use control list. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. This is neither legal advice nor customs advice.
Basezoll.halowerk.comfrom $0.0038 endpoints - HHome Energy CalculatorsCrypto & DeFi
Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.
BaseSolanaPolygon+1home-energy-calc.x402tookit.comfrom $0.029 endpoints - Aapi.arcgate.devCrypto & DeFi
Swap quote
EVM chain 5042Baseapi.arcgate.devfrom $0.00513 endpoints - BBase Token SafetyCrypto & DeFi
Base ERC-20 check before an agent buys or holds a token. Input: one contract address. Output: allow, warn, or block. Block: not a contract, not an ERC-20, zero supply, or the owner or token contract holds at least 50 percent. Warn: 20 to 50 percent held, proxy (EIP-1967, EIP-1167, or implementation()), or bytecode contains mint or pause. A selector does not prove the public can call it. Concentrat
Basebase-token-check.fly.devfrom $0.013 endpoints - 889-116-220-218.sslip.ioCrypto & DeFi
Base mainnet head: latest block number, block age in seconds, base fee and gas price in gwei. Use it to check the chain is advancing and to estimate fees before sending a transaction. One small JSON read instead of several raw RPC calls and unit conversions.
Base89-116-220-218.sslip.iofrom $0.0016 endpoints - Qquantum-artificer.surewhynot.appCrypto & DeFi
Physical chemistry (Cantera + CoolProp): chemical equilibrium, adiabatic flame temperature, ignition delay, reactor simulation, flame speed, and thermo/transport/fluid properties. Bundled mechanisms (gri30, h2o2, air). Paid in USDC on Base or Solana.
BaseSolanaquantum-artificer.surewhynot.appfrom $0.0035 endpoints - RRugShield Solana Rug CheckCrypto & DeFi
Solana pump.fun token warnings: sniper-linked fees and creator launch/graduation history. Advisory signals evaluated on selected historical tokens; results may differ for new tokens. Returns RISK_FLAGS or NO_FLAGS; NO_FLAGS does not mean safe. Input: token mint (base58). Replace :address or {address} with the actual mint. Templates are discovery only: do not pay. Ask the user if the mint is missin
BaseSolanagetrugshield.comfrom $0.013 endpoints - AAgent Rest StopCrypto & DeFi
Read a public web page and return its visible text. Send url. The response includes the final url, the page title, the HTTP status, and the page text.
Baseagentreststop.comfrom $0.0024 endpoints - FFlowCrypto & DeFi
Use when an agent is about to pay another agent and needs one finished answer first: should you pay this payee? PayCheck ($0.50) runs Flow's whole checker stack on the payee — payee verdict (kind, activity, contract safety), wallet approval-exposure audit, and recent USDC settlement history on Base — returning one grade (ALLOW / REVIEW / BLOCK, 0-100), a verify_status, all checks, the evidence, an
BasePolygonArbitrum+1flow-kg4x.vercel.appfrom $0.019 endpoints - Ppitcrew-api.appin60.comCrypto & DeFi
Why did my transaction fail? Give a chain and tx hash; get status, decoded method, gas used vs limit, fee, token transfers, events and, for failed transactions, the decoded revert reason (Error(string), Panic codes, custom errors resolved by signature) with a plain-language fix. Pending transactions get a stuck-transaction diagnosis (nonce gap, underpriced fee) and the replace/cancel recipe. Chain
BaseArbitrumpitcrew-api.appin60.comfrom $0.0057 endpoints - EESGPulseCrypto & DeFi
CSRD compliance roadmap for sustainability-reporting and compliance agents. Returns which ESRS standards apply, what must be disclosed, phase deadlines, and a double-materiality assessment guide.
BaseSolanaPolygon+8esgpulse.theaslangroupllc.comfrom $0.0517 endpoints - PProtocol Radar - Aaron ZhangCrypto & DeFi
Status of every Ethereum Improvement Proposal as JSON: number, title, status (living, final, last-call, review, draft, stagnant, withdrawn) and link, plus counts by status. Parsed live from eips.ethereum.org (EIPs are CC0).
BaseBase Sepoliaaaron-protocol-radar.vercel.appfrom $0.014 endpoints - PPreIPO Feed by Aaron ZhangCrypto & DeFi
Anthropic pre-IPO fundamentals as JSON: FY2025 revenue and May 2026 run-rate revenue, operating expenses, operating and net loss, compute and infrastructure spend, compute obligations, cash and short-term investments, top-customer revenue share, compute cost per revenue dollar. Each number has its own source URL, verification grade and value type (approx, lower bound, exact, derived).
BaseBase Sepoliapreipo-feed.vercel.appfrom $0.017 endpoints
KushBitx AgentProofCrypto & DeFiFast pre-payment sanity check for agents on Base: confirms the RPC reports Base mainnet (chain ID 8453) and that the official USDC contract has deployed code. No request body. Returns PASS or FAIL with both checks and a timestamp. It is not a token-risk report, transaction simulation or payment proof.
Basekushbitx.comfrom $0.0015 endpoints- Xx402 PulseCrypto & DeFi
Live BTC/ETH/SOL prices + the Crypto Fear & Greed Index in one call. Sourced from CoinGecko and alternative.me public data, combined for convenience.
Basex402-pulse-seller-production.up.railway.appfrom $0.0021 endpoint - Ttoken-riskCrypto & DeFi
Deterministic on-chain structural risk report for an ERC-20 token on Base. Keyless x402-native payment — no signup, no API key. Reports STRUCTURAL risk, not reputation: centralized-control powers (mint/pause/blacklist) are flagged regardless of issuer. Score 0-100, higher = structurally safer. See free real samples before paying: GET /samples/index.json
Basetoken-risk.comfrom $0.012 endpoints - OOnRamperXCrypto & DeFi
OnRamperX is a non-custodial value router for agents and humans: fiat<->crypto and cross-chain via one quote interface (Coinbase Onramp v2, Relay, x402). This endpoint returns the router's live capabilities and rail status; use /api/x402/quote for a ranked route. Settlement centers on USDC on Base.
Baserouter.mudko.comfrom $0.0051 endpoint - Xx402-research-iota.vercel.appCrypto & DeFi
Use before interacting with an unfamiliar Base (chain 8453) address: returns a public-data red-flag snapshot (contract vs EOA, EIP-7702 delegation, source verification, upgradeable proxy, age, activity, ETH/USDC balance, risk level). Pass ?address=0x... Errors: 400 invalid address. Informational only.
Basex402-research-iota.vercel.appfrom $0.0038 endpoints - MMioDio Meridian SDN ScreenCrypto & DeFi
MioDio Meridian OFAC SDN screen: exact match of one digital-currency address against public SDN Digital Currency Address entries (~$0.005 USDC Exact on Base). Informational only. Use before interacting with an address to check it against public OFAC SDN digital currency entries. Errors: 400 invalid_address or unsupported_chain, 402 payment required, unexpected 5xx is not charged. MioDio x402 DeFi.
Baseworkers.miodiollc.comfrom $0.0056 endpoints - Xx402-funding.onrender.comCrypto & DeFi
Cross-venue perpetual funding divergence: Hyperliquid against a liquid CEX benchmark (Binance, falling back to OKX where Binance restricts the region), annualised, with the direction of the basis trade.
Basex402-funding.onrender.comfrom $0.022 endpoints - Aapi.fairseal.ioCrypto & DeFi
Notarize an AI agent decision, audit record, or any payload to Base mainnet. Submit SHA-256 hash + metadata; get a tamper-proof verifiable receipt immediately. Merkle proof and on-chain anchor_tx available free after batch (~120s). Use Idempotency-Key to prevent double-charges on retry.
Baseapi.fairseal.iofrom $0.051 endpoint - TTaxPulseCrypto & DeFi
Income tax rates by country, corporate tax, capital gains tax, tax residency rules, crypto tax treatment for any jurisdiction. Worldwide guide giving a full tax overview of any country by scenario. Tax intelligence, not advice.
BaseSolanaRobinhood Chain+9taxpulse.theaslangroupllc.comfrom $0.1015 endpoints - PPackage HealthCrypto & DeFi
npm package adoption: downloads last week and month, plus trend within the month and a popularity band.
BaseSolanaPolygon+1package-health.x402tookit.comfrom $0.028 endpoints
ZenSchedCrypto & DeFiZenSched `timesheet_status` — Shift-pair timesheet status for a period: complete/open, hours, GPS, approval/lock flags, pending edits. period: YYYY-MM, YYYY-MM-DD:YYYY-MM-DD, current (payroll window), or blank (calendar month). Optional worker_id, worker_ids_json, event_id. level: 0/1/2 vendor approval level (default 0 = approved_0). Pay-per-call $0.01 USDC; the paying wallet owns the org (auto-pr
Basemcp.zensched.comfrom $0.0115 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.