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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
nsgoods Crypto Market RegimeCrypto & DeFiCMC regime classification + strategy spec (USDC pay-per-call). Free preview: GET /regime/preview A bad or unsupported id returns 400; upstream failure returns 503; you are never charged for an error.
Baseregime.nsgoods.orgfrom $0.011 endpoint- RRandom integersCrypto & DeFi
Generate one or more uniformly-distributed random integers in an inclusive [min, max] range.
Baserandom.openverbs.comfrom $0.0024 endpoints - PPreflightCrypto & DeFi
Call before installing packages suggested by a language model. Returns, for each npm or PyPI package name, whether it actually exists in the registry, whether it is deprecated or yanked, and — when the name is not found — the closest real package names. Catches hallucinated dependencies (slopsquatting) before an agent installs them. Never inspects package contents and never returns a safety verdic
Basepreflight402.comfrom $0.054 endpoints - Nnpm-downloads-range.hergertsynthora.comCrypto & DeFi
Returns a per-day download time series for an npm package over a period from keyless api.npmjs.org — the raw signal for trend and growth-rate detection. Lets autonomous agents compute momentum/decline and feed agent-to-agent dependency-selection scoring. Ranking surface for trajectory. First call FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.
Basenpm-downloads-range.hergertsynthora.comfrom $0.0011 endpoint - TTAP Labs (made by TAP)Crypto & DeFi
Safety Check (TAP Labs (made by TAP)): Token safety and security check for a token on Base or Solana, or a contract on Base, before you buy or swap. Looks for scam and rug pull warning signs: who can mint, freeze, blacklist, pause, tax or upgrade it, thin liquidity, a brand-new pool, big holders (Solana; Base tokens under 5 hours old), unverified code and scam-list matches (Base) and OFAC sanction
Baselabs.theatlasproject.devfrom $0.012 endpoints - RRoll diceCrypto & DeFi
Roll dice notation with a cryptographically secure RNG, optionally repeated. Returns per-die rolls, the kept dice and the total for each roll.
Basedice.openverbs.comfrom $0.0023 endpoints
TeardropCrypto & DeFiTeardrop crypto research agent over A2A: ask in plain language about token prices, DeFi yields and lending, wallet portfolios, approvals and counterparty risk, or onchain transactions; the agent plans and runs Teardrop's onchain data tools and returns a completed task. Pay per task with x402 USDC on Base.
Baseapi.teardrop.devfrom $0.00230 endpoints- Aapi.stacktr.eeCrypto & DeFi
Stacktree: host generated HTML as a live, shareable web page on a permanent, private, unguessable link ($0.50). POST any HTML (a report, dashboard, landing page, static site, or any webpage an agent produced) with payment; we return the URL and a one-time claim token. No account, no key, no human in the loop. The paying wallet can update the page free at the same URL, and a deleted page is restora
BaseSolanaapi.stacktr.eefrom $0.502 endpoints - SsendcheckCrypto & DeFi
SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}
Baseapi.pennyforge.orgfrom $0.012 endpoints - AAero AllocatorCrypto & DeFi
Where an Aero sAERO position stands on Base: its voting power and lock, how much is idle or allocated to gauges, when it can next be re-allocated (the wait after any allocation, 47 hours at launch), what it earns per day now versus the best split of gauges for its own size (fees plus incentives, after its own dilution), and a stay / switch / allocate recommendation. Pass ?tokenId= or ?address=. Re
Baseaeroallocator.appfrom $0.053 endpoints - Aaegis-audit-x402.project-easy-x.workers.devCrypto & DeFi
USE WHEN: An autonomous DeFi agent needs to POST { chain, address } to verify smart contract honeypot traps, owner privileges, and pool liquidity.
Baseaegis-audit-x402.project-easy-x.workers.devfrom $0.012 endpoints - Xx402payswap.vercel.appCrypto & DeFi
Premium alpha — Curated on-chain alpha: yield venues, mempool anomalies, and replayable agent trade intents.
Basex402payswap.vercel.appfrom $0.011 endpoint - AAgent Trust ScoreCrypto & DeFi
On-chain trust/reputation score for a Base agent wallet
Basex402.cheetahsecurity.defrom $0.021 endpoint - Wwriggly-singer-earpiece.ngrok-free.devCrypto & DeFi
Pre-trade risk check for any Base ERC-20 token address. Returns a deterministic verdict (LOW/MEDIUM/HIGH/EXTREME), 0-100 risk score and the exact signals behind it: honeypot, buy/sell tax, mint/owner powers, proxy, closed source, holder concentration, liquidity depth, pair age. No AI, same input = same answer. Automated heuristic, not financial advice. Data: GoPlus Security, DEX Screener, Base RPC
Basewriggly-singer-earpiece.ngrok-free.devfrom $0.0056 endpoints - OOn-chain ForensicsCrypto & DeFi
On-chain Forensics API for AI agents: token verdict cards and settle-safe pre-trade screens ($0.02), ERC-20 burn/mint and wallet forensics ($0.05, Base/Ethereum/XRPL), and $0.25 due-diligence memos. Bare URL = $0.02 directory tier; data endpoints at /functions/forensicsApi
Basesolene-fa2010da.base44.appfrom $0.022 endpoints - Ppegproof.comCrypto & DeFi
Current summary row for one Robinhood tokenized-stock token: total supply, treasury balance, multiplier, and whether the queried address is a known look-alike of a tracked token. Identify by ticker or exact contract address. On-chain observations reconstructed from chain event logs, not financial advice.
BaseArbitrumpegproof.comfrom $0.0022 endpoints - Ppaid-mcp-opportunity-lab--taylorboucher1.replit.appCrypto & DeFi
Read official Base Uniswap V3 NFT and pool state at one canonical block hash. Reconcile exact token inventory and fee-growth checkpoints against optional reported raw amounts. Return signed discrepancies, reproducible inputs and uint128 accounting semantics. Recorded tokensOwed may include withdrawn principal, not only fees. Read-only; no USD valuation, trading, custody or profitability claim.
Basepaid-mcp-opportunity-lab--taylorboucher1.replit.appfrom $0.011 endpoint - Hhorizon-pulse.vercel.appCrypto & DeFi
Horizon Pulse — real-time crypto market data + momentum signals (BTC/ETH/SOL) tuned for AI agents
Basehorizon-pulse.vercel.appfrom $0.0051 endpoint - Aapi.trackrecordsui.comCrypto & DeFi
One crypto allocation per day, fixed after the daily close. Since 12 September 2026 each day is fingerprinted on Sui before execution; earlier days were fingerprinted together on 11 September. Past days per call; today's allocation from 07:00 Zurich per call or with a pass. Each day from 2 October 2026 can be checked against Sui without trusting the seller.
Basesuiapi.trackrecordsui.comfrom $0.052 endpoints - PPulseChain HeadCrypto & DeFi
Latest PulseChain block number and timestamp.
Baseapi.immuta.appfrom $0.0011 endpoint
cogDepotCrypto & DeFicogDepot agent marketplace API. The per-call offer buys this one response and creates no account. Any credit pack offer buys credits for the paying wallet's account; a first pack payment creates the account.
Baseapi.cogdepot.comfrom $0.011 endpoint
AgentTalkCrypto & DeFiBefore your agent negotiates or shares data with another agent, make both prove they qualify. Open a channel with on-chain conditions (hold 1,000,000 USDC, hold a governance token, carry a verified attestation). Every agent proves wallet control and is checked on live chain state across 34 chains, with a signed result anyone can verify offline. Re-check on demand; whoever stops qualifying is remov
BasePolygonArbitrumskyemeta.comfrom $0.153 endpoints- Cchainhilt-x402Crypto & DeFi
Select the best available swap quote and return ordered unsigned transaction actions. Run the returned actions in order: up to two approvals, then the swap.
Basechainhilt.aifrom $0.0012 endpoints
BridgePilotCrypto & DeFiCross-chain bridge route quotes: compares LI.FI and Across for EVM transfers (Ethereum, Base, Arbitrum, Optimism, Polygon), computes net received value in USD, filters unsafe routes and ranks the best one with alternatives. Quote only, non-custodial.
Basebridgepilot.onrender.comfrom $0.012 endpoints- Xx402checkCrypto & DeFi
Check before paying any x402 tool: is this API a scam/safe? Trust-check one seller URL (live 402 + history). Use for verify-payTo, uptime, price/wallet drift, budget guard, validate 402, debug failing settle. Returns ok|caution|avoid + that tool's history only. $0.01/URL. No free tier. Endpoint+history — not wallet OFAC/simulation. Optional deeper signal: GET /preflight/deep ($0.05).
Basex402check.devfrom $0.011 endpoint - PpkgproofCrypto & DeFi
Call before an agent runs npm install. Checks one npm package against the registry, OSV advisories, install scripts, typosquat and combosquat names and repository provenance, and flags hallucinated or slopsquatted names. Answers safe, caution, block or does_not_exist; every reason is sourced and labelled fact or heuristic.
Basex402.pkgproof.netfrom $0.051 endpoint - QQuick Signal TACrypto & DeFi
Quick Signal TA v3.1.0 — Crypto technical analysis. Ten indicators with natural-language assessments. Query params: token (required), timeframe, bollinger_period, rsi_period.
Basesignal.quickai.buildfrom $0.051 endpoint - Iintel.hugen.tokyoCrypto & DeFi
Multi-source token due diligence — same aggregation as token-report (security checks, market data, liquidity analysis from 4+ sources) with weighted 0-100 risk scoring and red/green flags. No AI verdict prose — structured score only. For AI-synthesized rationale and recommendations, see /intel/token-report ($0.50). Accepts USDC payments on Base and Solana
BaseSolanaintel.hugen.tokyofrom $0.021 endpoint - CascadeWatchCrypto & DeFi
Liquidation cascade simulation — Morpho Blue chained-liquidation exposure
BaseSolanaEVM chain 5042cascade.lonestaroracle.xyzfrom $0.103 endpoints - Aaurelius-node-02-socal.onrender.comCrypto & DeFi
Aurelius Node 02: Real-time SoCal Pacific Gateway ground-truth oracle for cross-referential supply chain AI agents. Serves a live, actively updated 42-item matrix (13 subfields each) tracking Port of LA/LB vessel queues & gate turn times, Alameda Corridor rail counts, I-710/I-15 truck speeds, Inland Empire Class-A warehouse vacancy, CARB/SCE energy grid loads, & Otay Mesa cross-border wait times.
Baseaurelius-node-02-socal.onrender.comfrom $0.051 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.