Find an agent your AI can call

Read-only blockchain lookups over public RPC. A 0x wallet address gives native ETH and USDC balances, nonce and whether it is a contract (Base by default, Ethereum if you say so). Say 'token' with a contract address for ERC-20 name, symbol, decimals, total supply, proxy/upgradeability and risk flags. Send a .eth name (or an address with 'ENS') to resolve it either way. Same logic as the paid x402 endpoints. Pricing: 3 free calls/day, then $0.02 per call (USDC via x402).

Send an ERC-20 token contract address (Base by default, say 'ethereum' for mainnet). It reads the contract live over public RPC (name, symbol, decimals, total supply, owner, upgradeable proxy, mint/pause/blacklist functions in the bytecode, risk flags), then writes a short plain-language verdict from those facts only: what the token is, what the owner can change, and what to check before you buy, accept or list it. Facts plus an AI read on free open-weight models; not financial advice and not an audit. Pricing: 3 free calls/day, then $0.02 per call (USDC via x402).

Pay-per-request Arkham wallet intelligence and market data API protected by x402.

CoinCap gives AI agents, apps, and developers real-time cryptocurrency market data. Two ways to access: - **API key** — sign up at https://coincap.io and pass `Authorization: Bearer <key>` or `?apiKey=<key>`. - **Keyless x402** (agents) — the 12 `agentFriendly` endpoints accept per-call USDC payment on Base via the [x402 protocol](https://x402.gitbook.io/x402). No signup needed. See `/.well-known/x402.json` for the machine-readable payment catalog.

For finance professionals and institutions. Glassnode integrates trusted digital asset market and on-chain data, analytics, and research in one platform.

ENS resolution, reverse resolution and identity enrichment for agents, pay per call in USDC on Base via x402 or MPP.

Mycelia Signal Sovereign Oracle — three-layer data pyramid. Layer 1 Oracle Data (raw signed measurements), Layer 2 Oracle Information (structured context), Layer 3 Oracle Intelligence (cross-domain pattern recognition), Layer 4 Oracle Wisdom (longitudinal pattern synthesis — coming soon). x402 payments (USDC on Base). Ed25519 signed. No API keys. **MCP:** this API is also available as a Model Context Protocol server over streamable HTTP at `api.myceliasignal.com Attach the URL as a custom MCP connector; paid tools are x402-gated at the same prices listed here.

Nansen blockchain analytics API. Pay-per-call via x402 — no API key required. MPP (Tempo) is also available as an alternate payment rail.

Build on EVM RPC operated by NodeFlare. Published compute-unit prices, regional failover and a free 3M CU plan. Pay by card or crypto.

OneSource - three data families for AI agents on one host: Ethereum mainnet, Sepolia testnet, and Robinhood Chain RPC (served from OneSource-operated nodes), plus Deepstate on-chain market data (order books, trades, candles, stats, analytics) under /deepstate/v1/* - spec at api.onesource.io - plus The Standard Reserve (TSR), an on-chain reserve protocol on Robinhood Chain, under /standard/v1/* - spec at api.onesource.io Per-call or batch/session payments: USDC on Base via x402, or pathUSD/USDC.e on Tempo via MPP.

Otto AI runs a swarm of autonomous agents exposing 84 pay-per-call services on x402 V2 across eight capability tags — Market & Token Intelligence, DeFi & Markets Data, Web & Domain Intelligence, Real-World Data, AI Creative & Tools, Portfolio & Accounts, Execution, and x402 Open Router. Settled in USDC on Base on every endpoint; 66 of 84 also accept USDC on Solana (each path's x-payment-info.networks names its own; the live 402's accepts[] is authoritative). Permit2-ready for any ERC-20. From $0.001 per call.

ApiToll runs pay-per-call data agents on x402 (USDC on Base + Solana). This service returns real-time crypto + DeFi market data — token prices, DeFi yields, TVL, stablecoin supply, and DEX volume — paid per call, no subscription, no API keys. Sourced from DefiLlama across every major chain.

Top cryptocurrency prices and charts, listed by market capitalization. Free access to current and historic data for Bitcoin and thousands of altcoins.

150+ chains, in any AI client. Install the Allium MCP server, skill, or CLI in one command — or skip the API key entirely and pay per query in USDC.

Search onchain DEX pools and token, by contract address, name, or token symbol.

Latest daily stock quote for a US-listed ticker. Returns the most recent completed trading session: open, high, low, close, volume, VWAP, and trade count, plus the change and percent change versus the prior session, and company reference d… (108 paid endpoints on 2s.io.)

AgentCheck: independent report on an x402 seller before you pay it. Are its buyers real (repeat wallets on their own money) or funded by the seller itself, measured from 30 days of on-chain payments, plus results of our own paid test purch… (3 paid endpoints on agentcheck-kohl.vercel.app.)

Payment flow verification for agents integrating x402: confirms your wallet and payment channel work before you spend on a real endpoint. Category: infra. (19 paid endpoints on agentforge-taupe.vercel.app.)

Book a paid Resy reservation for the authenticated user using a slot config token. (2 paid endpoints on agentic-reservations.vercel.app.)

Fresh operational audit of any public agent or paid API: reachability, latency, HTTP status, x402 challenge, price/network/payTo, OpenAPI, agent card and MCP manifest. Returns a 0-100 score, verdict and issues. Try GET /agent-health/sample. (117 paid endpoints on x402.agentindex.world.)

VIN decode (x402; 402 first, $0.005, Base then Solana)

Check whether a website, business, or wallet is a scam before an agent trusts or pays it — fraud, phishing and rug-risk screening. Returns verdict (safe/caution/avoid), trust_score, domain age, red_flags. Input: ?target=domain (21 paid endpoints on agents.dyoeway.org.)

Extract a public HTTP(S) page into JSON: title, description, JSON-LD, Open Graph, headings, links, and AI-readiness signals. No JavaScript; 12-second timeout; 3 MB cap. Paid JSON keeps requestedUrl, finalUrl, status, sourceOk, error, and c… (3 paid endpoints on agents.samedaydesk.com.)

Run a transaction simulation and EVM safety preflight with gas, destination proxy evidence, and optional token security and allowance checks in one decision-ready report. (31 paid endpoints on ai-data-marketplace-1042299154756.us-central1.run.app.)

AgentOracle: list real-time on-chain crypto tokens sorted by market cap, with chain / min-liquidity / min-24h-volume / min-market-cap filters and limit+offset pagination. Each row includes price, 24h volume, market cap, liquidity, 24h pric… (6 paid endpoints on aiagentoracle.ai.)

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. (2 paid endpoints on alest-x402.alest.workers.dev.)

Real-time pre-trade signal: a probability snapshot of Hyperliquid's HIP-4 prediction markets - crypto price binaries, sports outcomes, tournament winners, Fed rate decisions, and more. Fields are parsed verbatim from Hyperliquid, so new ma… (15 paid endpoints on alphapipeline-eu.onrender.com.)

Live Base wallet balance for AI agents. Returns native ETH and Circle USDC balances, atomic values, block height, contract address, and observation time for any EVM address. Includes a machine-readable upgrade path to treasury readiness fo… (3 paid endpoints on anywaypossible.com.)

IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain

IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain