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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
291 results- 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
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 - 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 - LLLM Cost & Capacity CalcCrypto & DeFi
Compare realtime and batch API cost for a workload with your discount fraction, and the money saved by waiting.
BaseSolanaPolygon+1llm-cost-calc.x402tookit.comfrom $0.028 endpoints - JJewelry Maker CalcCrypto & DeFi
Number of beads for a strand of a given finished length from bead size and spacing, with finished length and total weight.
BaseSolanaPolygon+1jewelry-calc.x402tookit.comfrom $0.028 endpoints - Xx402checkCrypto & DeFi
Live x402 conformance pre-flight check: pass ?url=<x402 endpoint>, get a structured PASS/WARN/FAIL verdict on its 402 challenge before you trust it with a real payment.
Basex402check.arden-instance.workers.devfrom $0.0022 endpoints
Lorg CheckCrypto & DeFiIs this address safe to pay? Sanctions lists, scam labels, EIP-7702 sweeper wallets, address-poisoning look-alikes and where the wallet's first funds came from. A signed allow, caution or block, an action and the reasons.
Baseapi.lorglabs.comfrom $0.012 endpoints- TTxGuardCrypto & DeFi
Explain and preflight an unsigned Base transaction, EIP-712 typed data, or an EIP-3009 x402 payment authorization before you sign it. Decodes intent against verified ABIs, resolves proxies, classifies approvals, and checks a payment authorization against the quote it claims to pay: recipient, amount, asset, chain, freshness, and nonce replay. Returns unknown rather than guessing when a selector is
Basetxguard.schemasure.comfrom $0.021 endpoint
Japan Stablecoin Payment MonitorCrypto & DeFiJapan Stablecoin Payment Monitor: weekly change feed for stablecoin payment services in Japan — new launches, pilots, partnerships, fee changes, supported assets and chains, and closures. Each event is dated, categorized and tied to an official source URL. Pass changedSince=YYYY-MM-DD (your last run date) to fetch only new events; an empty changes list explicitly means no change. Without changedSi
BaseEVM chain 5042open-pay.jpfrom $0.0025 endpoints- Aauditor-x402.onrender.comCrypto & DeFi
Price of ONE token: on-chain USD spot price for a single ERC-20 on Base, from the deepest Uniswap v3 pool vs USDC/WETH (slot0), with the pool/fee tier used and its USD depth. No off-chain feed; thin pools are easy to manipulate. To price MANY tokens at once, use multi-token-price instead (one cheaper call).
Baseauditor-x402.onrender.comfrom $0.00217 endpoints - PPayeeGuardCrypto & DeFi
Pre-flight a Base payment destination before you send. Verifies the EIP-55 checksum, measures distance from an address you expect — catching a mistyped digit and the shared prefix-and-suffix shape of a ground look-alike — flags the zero address, burn sinks and precompiles, refuses a token offered as its own payee, and reports whether the destination can receive the asset. Returns unknown rather th
Basepayee.schemasure.comfrom $0.021 endpoint - AAllowanceGuardCrypto & DeFi
Decide whether to grant an ERC-20, NFT or Permit2 allowance before signing it. Send owner, token, spender and amount, or the unsigned approve, setApprovalForAll or Permit2 calldata. Returns allow, warn, block or unknown with the allowance already on chain, the requested scope and the rule behind it, whether this raises or lowers exposure, and whether the spender is a contract, upgradeable or denyl
Baseallowance.schemasure.comfrom $0.031 endpoint - Ggblin-sentinel.vercel.appCrypto & DeFi
Call before your agent acts on ETH, BTC or USDC on Base: are the Chainlink feeds fresh, and is any of the three in caution or risk-off? One normal/caution/risk-off verdict per asset from feed age, price moves and a USDC depeg check. Cheap enough to poll before every trade.
Basegblin-sentinel.vercel.appfrom $0.0022 endpoints - Ddefi-signals.orgCrypto & DeFi
Cross-venue perpetual funding rates (OKX, Kraken Futures, dYdX) for any major token. Per-venue annualized rates plus the cross-venue spread in percentage points — a ready-to-use funding arbitrage signal. Clean JSON for trading and research agents.
Basedefi-signals.orgfrom $0.0022 endpoints - Aalest.ioCrypto & DeFi
On-chain state of ALST, the alest.io token for a tokenized Tesla Cybercab robotaxi (real-world asset). Name, symbol, decimals and total supply read live from Base Sepolia testnet.
Basealest-x402.alest.workers.devfrom $0.012 endpoints - Bbase-intel-api.jakemaxsigal.workers.devCrypto & DeFi
Base gas oracle / Base gas price API / Base L2 gas fee tracker / real-time gas estimator / swap cost estimator. Returns the current Base fee, fast/standard/slow priority tiers, the USD cost of a typical swap, and a congestion recommendation. For AI agents, trading bots, and wallets timing transactions on Base to minimize gas.
Basebase-intel-api.jakemaxsigal.workers.devfrom $0.0023 endpoints - Ccryptoshark.duckdns.orgCrypto & DeFi
Current USD market snapshot for a supported cryptocurrency symbol or CoinGecko asset name
Basecryptoshark.duckdns.orgfrom $0.0012 endpoints
BlackForgeCrypto & DeFiBlackForge crypto market data from the major spot exchanges: every column, 1-minute to daily buckets, 90-day lookback. Covers 100 billable rows; finer buckets and premium columns count as more than one row each.
BaseArbitrumPolygonapi.blackforge.sofrom $0.0052 endpoints- SSSL/TLS Certificate CheckCrypto & DeFi
SSL/TLS certificate check: expiry, issuer, SANs, chain validity, hostname match, negotiated protocol/cipher, and weak-algo warnings for a public HTTPS host. Clean JSON.
BasePolygonArbitrum+1ssl.use.x402atlas.comfrom $0.011 endpoint - NNythosX Agent ToolsCrypto & DeFi
USD price of a chain's native token, no gas data. Just the native-token USD price (ETH, POL or SOL), sourced from MEXC/Gate.io/Coinbase with the same price feed get_gas_price uses. Use this when you only need the asset price, not fees — get_gas_price and compare_gas_costs already return nativeUsd alongside gas data, so call this instead only to skip the gas lookup (e.g. valuing a wallet balance, n
Basetools.nythosx.comfrom $0.0013 endpoints - 33HZ Daily FX Reference RateCrypto & DeFi
Daily reference foreign-exchange rate for any supported fiat currency pair using Frankfurter/ECB reference data. Query base and quote ISO 4217 codes. For conversion, normalization, accounting and reporting; not live trading data.
Basewallet-services-poc-clean-mainnet.3hz-services.workers.devfrom $0.0013 endpoints
nsgoods Crypto Signals (Kraken)Crypto & DeFiAtomic technical indicators (RSI, EMA20/50/200, MACD, ATR, Bollinger, volume) for any Kraken */USD pair and timeframe. Cheap high-frequency poll endpoint for AI trading agents (USDC on Base). Free preview: GET /signals/preview Bad input (unknown pair) returns 400; upstream outage returns 503; you are never charged for an error.
Basesignals.nsgoods.orgfrom $0.0054 endpoints- Ffaultcode-diagnostic-mcp.bowling-anthony.workers.devCrypto & DeFi
What a vehicle fault code means, with source-attributed generic and make-specific definitions and any disagreement between sources stated.
Basefaultcode-diagnostic-mcp.bowling-anthony.workers.devfrom $0.0061 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.