On-chain data: MCP servers, A2A agents and x402 APIs

• base-token-check.fly.dev Live x402

  Base ERC-20 check before an agent buys or holds a token. Input: one contract address. Output: allow, warn, or block. Block: not a contract, not an ERC-20, zero supply, or the owner or token contract holds at least 50 pe…

  x402 paid API · 3 endpoints

• billionaireorder.com Live x402

  For AI agents building agent swarms, synthetic users, NPCs, or trading bots. Input: archetype + prompt (e.g. 'risk-taking crypto founder'). Output: OCEAN Big Five + Dark Triad + trading psychology vector with emotional…

  x402 paid API · 6 endpoints

• bizintel-api.hahavoid0.workers.dev Live x402

  Queries foreign exchange currency pairings from the free Frankfurter database. (6 paid endpoints on bizintel-api.hahavoid0.workers.dev.)

  x402 paid API · 6 endpoints

• blockchain-api.x402-chain-tools.workers.dev Live x402

  Check the latest or current Base Mainnet block number. Use this to get the live Base block height. (4 paid endpoints on blockchain-api.x402-chain-tools.workers.dev.)

  x402 paid API · 4 endpoints

• blockchain.info Live x402

  Paid AI-agent access to Blockchain.com Explorer API (55 paid endpoints on api.blockchain.info.)

  x402 paid API · 12 endpoints

• blockchainmoneymap.com Live x402

  Buyers need confidence that wallet, agent card, domain label, MCP server, seller profile, and x402 receiver belong together. (99 paid endpoints on api.blockchainmoneymap.com.)

  x402 paid API · 12 endpoints

• btc-radar.vercel.app Live x402

  Bitcoin protocol and software changes as JSON: Bitcoin Core merges and releases, BIP updates, Lightning spec and implementation changes. Each item has status (proposal, merged, released, activated), layer (consensus, po…

  x402 paid API · 3 endpoints

• chain.cyberwarex.com Live x402

  ENS name resolution in both directions on Ethereum mainnet. Pass name to resolve an ENS name to its address (forward), or pass address to get that address's primary ENS name (reverse, forward-verified so spoofed reverse…

  x402 paid API · 7 endpoints

• chain.openverbs.com Live x402

  Live recommended Bitcoin transaction fee rates (in sat/vB) for next-block, ~30-minute, ~1-hour, economy and minimum confirmation targets, straight from the mempool. Also estimates the total fee (in sats and BTC) for a t…

  x402 paid API · 12 endpoints

• chainscout.lonestaroracle.xyz Live x402

  On-chain intelligence — whale transfers trending tokens DeFi TVL on Base and Ethereum

  x402 paid API · 1 endpoint

• chainsscope.duckdns.org Live x402

  Current network fee conditions -- gas price (ETH/Base/Arbitrum/Optimism/Polygon), sat/vB fee tiers (Bitcoin), or recent prioritization fees (Solana) -- useful for an agent about to construct a transaction itself. (2 pai…

  x402 paid API · 2 endpoints

• chain.tollkit.dev Live x402

  Crypto token price in USD for AI agents: give a token contract address or mint (or "SOL") on Base, Ethereum or Solana, get its live USD price read on-chain from the deepest DEX pool (Uniswap v3, Orca Whirlpools), not fr…

  x402 paid API · 7 endpoints

• chainverdict.xyz Live x402

  Latest Base block: number, timestamp and hash. The cheapest call on the service — useful as a liveness and connectivity check. (22 paid endpoints on chainverdict.xyz.)

  x402 paid API · 12 endpoints

• coingecko.use.x402atlas.com Live x402

  Crypto token price in USD, EUR and more — real-time spot prices for one or many coins by CoinGecko id (bitcoin, ethereum, solana). (6 paid endpoints on coingecko.use.x402atlas.com.)

  x402 paid API · 6 endpoints

• content.hugen.tokyo Live x402

  Extract and classify all hyperlinks from a web page — internal vs external using eTLD+1 domain matching. Returns up to 200 internal and 200 external links with counts. No web crawler setup needed. Accepts USDC payments…

  x402 paid API · 5 endpoints

• convrgent.ai Live x402

  Create a new persistent human profile in the vault. Agent-namespaced by wallet address. Accepts initial identity, text samples, observations, and birth data. (2 paid endpoints on convrgent.ai.)

  x402 paid API · 2 endpoints

• crypto.openverbs.com Live x402

  Total value locked (USD) for one DeFi protocol by DefiLlama slug or name (e.g. "aave-v3", "lido", "uniswap-v3"): current TVL, per-chain TVL breakdown, 1h/1d/7d TVL change, category, chains, token symbol and market cap.…

  x402 paid API · 12 endpoints

• defi-api.agenticfi.wtf Live x402

  Social volume - Twitter/Farcaster mention count for a token (14 paid endpoints on defi-api.agenticfi.wtf.)

  x402 paid API · 12 endpoints

• defi-signals.org Live x402

  One-call market snapshot: BTC/ETH/SOL spot prices with 24h change plus the Crypto Fear & Greed index. The cheapest way for an agent to establish market context. (2 paid endpoints on defi-signals.org.)

  x402 paid API · 2 endpoints

• defi.agent-layer.tech Live x402

  Plan, open, adjust, and close concentrated liquidity positions on Uniswap V3 or V4. (2 paid endpoints on defi.agent-layer.tech.)

  x402 paid API · 2 endpoints

• defi.hugen.tokyo Live x402

  Check if a URL is a known crypto phishing or scam site — covers fake DEX frontends, wallet drainers, approval phishing pages, and counterfeit protocol clones. Real-time detection against threat intelligence databases. N…

  x402 paid API · 12 endpoints

• dexl.io Live x402

  DexL AI agent economy leaderboard - enriched with on-chain stats (7 paid endpoints on api.dexl.io.)

  x402 paid API · 7 endpoints

• dt0ur.online Live x402

  Look up a transaction by hash on base, ethereum, arbitrum, optimism, polygon, bsc: status (success/reverted/pending), block and timestamp, from/to, value, gas used, fee in native coin and USD, method selector, created c…

  x402 paid API · 12 endpoints

• eltociear-contract-guard.hf.space Live x402

  Risk check for an EVM contract/token address

  x402 paid API · 1 endpoint

• eltociear-tokenguard.hf.space Live x402

  Current weather + multi-day forecast for any city or lat/lon via Open-Meteo. Temperature, humidity, wind, precipitation, WMO condition codes. (125 paid endpoints on eltociear-tokenguard.hf.space.)

  x402 paid API · 12 endpoints

• ens-resolver.underscoredone.com Live x402

  Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.

  x402 paid API · 1 endpoint

• evm-gas.apitoll.cloud Live x402

  Multi-chain EVM gas price oracle for AI agents — 17 chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche…). One x402 call returns slow/standard/fast EIP-1559 tiers as DROP-IN maxFeePerGas + maxPriorityFee…

  x402 paid API · 1 endpoint

• fairseal.io Live x402

  Verifiable random numbers with cryptographic epoch references. Wesolowski 2048-bit VDF epoch chain with on-chain MerkleAnchor reference. For unbiased randomness: POST /v1/rng/commit (free), then GET the reveal_url retur…

  x402 paid API · 5 endpoints

• fiatdock.com Live x402

  Base latest block number + timestamp — a chain-head freshness probe. Pay-per-call via x402. (105 paid endpoints on fiatdock.com.)

  x402 paid API · 12 endpoints

• flipvo.com Live x402

  Cheapest possible paid call: proves your wallet, our 402, and the receipt path work. Returns pong and a timestamp. (13 paid endpoints on api.flipvo.com.)

  x402 paid API · 12 endpoints

• fullstack.cash Live x402

  Access to protected psf-bch-api resources (0.001 USDC)

  x402 paid API · 1 endpoint

• gaming.halowerk.com Live x402

  Evaluates caller-supplied telemetry samples against declared reaction-time, actions-per-second, movement-speed, and impossible-event rules. Flags are review signals only; the service does not identify software, inspect…

  x402 paid API · 10 endpoints

• getrugshield.com Live x402

  Solana token rug warnings for pump.fun tokens before buying: checks recent fees linked to known sniper clusters and whether the creator launched many tokens with few graduating. These advisory signals were evaluated on…

  x402 paid API · 3 endpoints

• gondola-ai.com Live x402

  OpenAI-compatible chat completions across the Venice AI model catalog. Pay per request in USDC on Base via x402, with no account and no API key. Overpayment is never lost: it banks as reusable wallet credit for your nex…

  x402 paid API · 3 endpoints

• hexscan.xyz Live x402

  Is this token safe to buy? Honeypot check -- can the token be bought but not sold? Fast honeypot detection for ERC-20 tokens. (2 paid endpoints on hexscan.xyz.)

  x402 paid API · 2 endpoints

• human.twin3.ai Live x402

  Human verification for AI agents — proof of humanity, sybil resistance, and 'is this wallet a real person' answers in one paid call. Returns two ZK-style outputs about any EVM wallet: (1) total humanity score 0-255 (15…

  x402 paid API · 1 endpoint

• insumermodel.com Live x402

  Signed attestation (ECDSA plus a post-quantum ML-DSA-65 companion) of on-chain wallet conditions across 37 chains: token balance, NFT ownership, EAS, Farcaster, view calls, ratio rules, account code (plain key, EIP-7702…

  x402 paid API · 3 endpoints

• intel.chainquery.com Live x402

  ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Live mempool fee-pressure signal (state low/moderate/high/severe + score in sat/vB). (5 paid endpoints on intel.chainquery…

  x402 paid API · 5 endpoints

• kenoodl.com Live x402

  x402-preflight: confirm your wallet can transact, and see your balance, in one certified call. Pay $0.01 USDC on Base, get a signed on-chain-anchored receipt. The safe first transaction before you ship real volume.

  x402 paid API · 1 endpoint

• kette.halowerk.com Live x402

  Checks one address on Ethereum, Base, Arbitrum, Optimism, Polygon or BNB Smart Chain against the open verification registry and against the chain itself. For a proxy the answer is deliberately split in two: whether the…

  x402 paid API · 2 endpoints

• lab.paidapis.net Live x402

  Aggregated market snapshot: Ethereum mainnet gas price (Gwei), ETH/USD spot price, and the latest Base mainnet block number and timestamp — combined into one call. Optional ?ref=<address> pays that wallet a 20% referral…

  x402 paid API · 7 endpoints

• launches.lonestaroracle.xyz Live x402

  New token launch scanner — Base and EVM chains, real-time pool data

  x402 paid API · 1 endpoint

• lion-x402-bible.lionmaster-operations.workers.dev Live x402

  Is this crypto wallet sanctioned? Instant OFAC SDN address screen for AI agents. Returns PASS/WARN/BLOCK. $0.001 Base USDC, keyless x402. Ed25519-attested. Upsell: full counterparty bundle $0.05. (3 paid endpoints on li…

  x402 paid API · 3 endpoints

• lion-x402.lionmaster-operations.workers.dev Live x402

  Keyless multi-chain JSON-RPC reads, Base + Ethereum, from $0.001 (?chain=ethereum) (2 paid endpoints on lion-x402.lionmaster-operations.workers.dev.)

  x402 paid API · 2 endpoints

• liquita-x402-edge.liquita.workers.dev Live x402

  Real-time at-risk DeFi borrowers across Aave V3, Morpho, Comet, Euler V2, Fluid, Moonwell, Spark on 11 EVM chains. Returns health factor, collateral, debt, and protocol. Updated every 5 minutes from the liquita liquidat…

  x402 paid API · 2 endpoints

• loopholetape.com Live x402

  New Solana tokens as they launch on pump.fun: a cursor feed of new memecoin launches with rug probability and graduation odds ($0.001 per poll). Use when a bot polls for newly launched Solana tokens on pump.fun with the…

  x402 paid API · 6 endpoints

• loyalspark.online Live x402

  Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents automate the rest via REST and MCP. Free plan mints up to 1,000 tokens…

  x402 paid API · 12 endpoints

• lucidcove.org Live x402

  Settlement canary: returns a timestamped pong JSON after USDC micropayment. Use to verify x402 client + wallet + facilitator end-to-end.

  x402 paid API · 1 endpoint

Related capabilities

x402 paid APIsTrading & marketsAgent infrastructureSecurity & trustResearchCrypto market dataMaps & travelWeb scraping

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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