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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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- Paid calls · 30 days
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Crypto & DeFi
5 results
Maha Context CompilerCrypto & DeFiCompress long documents and RAG inputs into token-budgeted, deduplicated context packs with source-linked provenance. Returns original and compiled token counts, so the saving is verifiable. Net-positive above N = fee / (r x p) tokens: r your reduction, p your input price. Extractive and budget-bound, so check includedPassages before relying on it. Ranks Latin, Cyrillic, Greek, Arabic and CJK; CJK
BaseArbitrumPolygonmahastrategies.comfrom $0.002215 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- 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
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
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.