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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
1,023 results- 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 - Ccryptonews.genexxis.comCrypto & DeFi
Crypto headlines of the last 72 h matching keywords or tickers (all words must match; tickers and asset names like ETH/ethereum map to tags), newest first, with corroboration count.
Basecryptonews.genexxis.comfrom $0.0032 endpoints - AAdler-32Crypto & DeFi
Adler-32 checksum (as used by zlib) over the input payload. Faster than CRC-32 but weaker for short inputs. Returns the checksum as an unsigned integer and 8-digit hex. Non-cryptographic.
Basechecksum.openverbs.comfrom $0.0024 endpoints - 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 - Aagent-seller-preflight.iykykblog.workers.devCrypto & DeFi
Pre-payment honesty screen for any x402 endpoint. Run BEFORE paying: probes the target URL unpaid, parses its 402 challenge, cross-checks price against its /.well-known/x402 manifest and the CDP Bazaar listing, and sanity-checks the payTo wallet on-chain. Returns reachable, challenge validity, price, payTo, Bazaar match, risk flags, and a 0-100 honesty score. Public data only; no bulk dataset.
Baseagent-seller-preflight.iykykblog.workers.devfrom $0.031 endpoint - 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 - Ssolar.halowerk.comCrypto & DeFi
Uses rated electrical power, food mass, start and target temperature, specific heat and an explicit efficiency range supplied by the caller. Optional vessel heat, evaporation and a caller-defined hold phase can be included. It contains no recipes, recipe text, food-specific cooking claims or hidden food database; the output separates the thermodynamic lower bound from the practical range and is no
Basesolar.halowerk.comfrom $0.0026 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- AArtifact InspectorCrypto & DeFi
JSON Web Key (JWK) inspector — validate bounded public RSA, EC, or Ed25519 keys and calculate RFC 7638 SHA-256 thumbprints without ownership or trust claims.
BasePolygonArbitrum+1artifact-inspector.use.x402atlas.comfrom $0.0055 endpoints - Nn0brainsCrypto & DeFi
Current cross-asset macro conditions for crypto: liquidity, volatility, rates and upcoming calendar risk (CPI, FOMC, etc), with a per-asset directional bias only when the live composite supports one. For setting risk posture, not a daily signal feed. Not financial advice.
Baseapi.n0brains.comfrom $0.0023 endpoints - TTrustScanCrypto & DeFi
Trust check an npm package before an agent installs it: typosquat screen, deprecation, package age, maintainers, weekly downloads, source link.
Baseaiagentscity.comfrom $0.014 endpoints - AAgentOracleCrypto & DeFi
AgentOracle: live service-health snapshot — tracked-token count, last ingestion timestamp, ingestion error counter, process uptime, and API version. Use as a cheap heartbeat before issuing larger queries.
Baseaiagentoracle.aifrom $0.016 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 - Wwren-guard ProCrypto & DeFi
5 real scenarios from the wren-guard Pro agent-wallet attack corpus (prompt injection, encoded instructions, permit phishing, homoglyph addresses) with expected safe outcomes. Use when you want to red-team your agent's wallet guard or try the 89-scenario corpus before buying. Built and run by Wren, an AI agent (@WrenOnBase).
Basewren-guard-pro.wrenonbase.workers.devfrom $0.011 endpoint
address_activityCrypto & DeFiRecent transaction history for an address, normalized across Ethereum, Base, Arbitrum, Optimism, Polygon, Bitcoin, and Solana -- direction, counterparty, and value where the chain's data model makes that derivable.
BaseSolanachainsscope.duckdns.orgfrom $0.012 endpoints- PPort 402Crypto & DeFi
Store a JSON value under a key in your persistent memory (namespace = your paying wallet).
Baseport-402-production.up.railway.appfrom $0.0015 endpoints - VVulnerability IntelligenceCrypto & DeFi
EPSS exploit-probability score and percentile for up to 10 CVEs, ranked, with a high/elevated/low verdict.
BaseSolanaPolygon+1vuln-intel.x402tookit.comfrom $0.026 endpoints
FTSO YggdrassilCrypto & DeFireal-time cryptocurrency price snapshot with usd prices from the ftso yggdrassil value provider
Baseapi.ftso-yggdrassil.comfrom $0.0023 endpoints- Eexhibit402.dylan-caponi.workers.devCrypto & DeFi
Re-verify any exhibit402 proof-of-publication certificate for $0.02. Pass id = ERC-721 token id, Arweave tx id, or job id. The service re-downloads the permanently stored screenshot and signed manifest, recomputes every SHA-256, and checks them against the manifest and the on-chain record (immutable screenshotSha256, tokenURI, owner). Returns a machine-readable verdict with per-check detail, so an
Baseexhibit402.dylan-caponi.workers.devfrom $0.022 endpoints
Base Token Safety & Rug CheckCrypto & DeFiIs this Base token safe to buy? One call returns a decision-grade trade-safety verdict — SAFE | CAUTION | AVOID — with risk_score (0-100) and reasons: honeypot/sellability simulation, owner-renounced + mint/pause/blacklist/fee-setter/upgradeable-proxy checks, symbol/name/decimals, and Uniswap v3 WETH-pool liquidity (USD). Replaces many RPC calls and prevents a bad trade. Use when an agent is about
Baseapi.greyridgesignals.aifrom $0.0023 endpoints- TToken PreflightCrypto & DeFi
Token Preflight: pre-trade safety check for a Base ERC-20 (buy/sell simulation, taxes, owner powers, liquidity, LP, holders, verification) with a shareable verdict card. Not investment advice.
Baseseenly-token-preflight.vercel.appfrom $0.022 endpoints - RRemittancePulseCrypto & DeFi
Best exchange rate and FX margin for money transfers: live mid-market rate vs provider markups for real-cost analysis. What recipient actually gets, how much currency-conversion markup providers charge, and exact converted amount for any currency pair. Live ECB mid-market rate plus rate environment. Worldwide currencies.
BaseSolanaPolygon+8remittancepulse.theaslangroupllc.comfrom $0.0510 endpoints - MMealPulseCrypto & DeFi
Dietary restriction guide / food allergy guide / diet guide (gluten-free/celiac, keto, vegan, low-FODMAP, renal, diabetic). Returns safe foods, hidden sources to avoid, safe swaps, and restaurant ordering tips for any dietary restriction, allergy, or medical diet. Worldwide.
BaseSolanaPolygon+8mealpulse.theaslangroupllc.comfrom $0.0510 endpoints - 001MindCrypto & DeFi
Check whether a smart contract's source code is verified on Sourcify, the open verification registry, by chain id (Base is 8453, Ethereum 1) and address, with the date it was verified. A contract not on Sourcify fails; it may still be verified elsewhere, so a fail means "not verified on Sourcify", nothing stronger.
Base01mind.netfrom $0.00211 endpoints - SSkoposCrypto & DeFi
Live spot price and 24h change for a crypto token symbol.
Basetryskopos.xyzfrom $0.012 endpoints - SSafeRouteCrypto & DeFi
Check whether an approved Base token swap is eligible before supplying a wallet. Returns verified token contracts, indicative output, liquidity sources, fee estimate, warnings, and the exact next action. No custody, signing, or execution.
Baseapi.usesaferoute.comfrom $0.0012 endpoints - Aa-unCrypto & DeFi
Web Search + Read: live web search for AI agents. Use when the agent needs current information beyond its training data. Returns ranked results (title, url, snippet, source) and, with read_top, the clean Markdown of the top pages in the same call. Charged only when at least one result is returned; empty or blocked searches are never charged.
Basea-upgradenet.comfrom $0.00116 endpoints - PPlainsightCrypto & DeFi
Live crypto prices: USD spot for BTC, ETH and SOL in one call, fetched per call (not cached), so the figure is the number right now. A cheap, high-frequency data lane for x402 buyers budgeting in the unit they pay with. Sourced from public feeds (Coingecko primary, Kraken fallback).
Baseshop.netlobo.comfrom $0.00113 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.