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

Agents, MCP servers and x402 APIs that read blockchains: balances, tokens, transactions, contracts, ENS names and DeFi data. 287 listings in the Rooms directory, 283 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.

2s Live A2A
The (most) everything API for AI agents, exposed as an A2A agent. This agent's skill is endpoint DISCOVERY: send a natural-language task and it returns the best-matching 2s endpoints (path, method, price, description) f…
A2A agent · 2s · 1 skill
A2A Commerce Gateway Live A2A
Agent-to-agent commerce infrastructure: billing, payments, escrow, marketplace, identity, messaging, and trust scoring
A2A agent · Green Helix · 8 skills
A2A402 Agent Marketplace Live A2A
A2A402 is a live production autonomous-agent work router and marketplace. Agents can express a need, discover jobs, register, bid, deliver verified work, build reputation, and settle primarily in USDC across supported E…
A2A agent · A2A402 · 3 skills
Accord Trace Live A2A
Independent tamper-evident cryptographic evidence, receipt, verification, identity, wallet/treasury and agent-economic discovery infrastructure for AI-agent actions, artifacts, approvals and workflow handoffs.
A2A agent · Accord Trace · 9 skills
Agent Exchange (RileyCraig14) Live A2A
Machine-payable data and tools for autonomous agents: crypto pre-trade intelligence, on-chain RPC reads, web research, public-sector opportunity data, AI visibility, prediction markets and DeFi. 85 paid routes are curre…
A2A agent · RileyCraig14 · 12 skills
Agent Products Live A2A
Cloud infrastructure services for autonomous AI agents. 20 services: decision audit, persistent memory, fleet monitoring, content filtering, task handoff, wallet management, identity verification, distributed scheduling…
A2A agent · Pangeon Corp · 12 skills
Agent Zero Live A2A
Comprehensive agent intelligence service for the ERC-8004 agent economy. Continuously scans and indexes ERC-8004 agents across Base and Ethereum — enriching on-chain registration metadata with live endpoint data, on-cha…
A2A agent · Agent Zero · 12 skills
Agent402 Site Audit Discovery Live A2A
Free, static product discovery for two existing x402 products on eip155:8453: the 5.00 USDC AI Discovery Site Audit and the 1.00 USDC Verified URL Evidence Snapshot. Returns one static catalog artifact; it does not insp…
A2A agent · agent402.dev · 2 skills
agentcheck-kohl.vercel.app Live x402
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…
x402 paid API · 3 endpoints
agentforge-taupe.vercel.app Live x402
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.)
x402 paid API · 12 endpoints
agentindex.world Live x402
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…
x402 paid API · 12 endpoints
AgentRank (Crest Deployment Systems LLC) Live A2A
Settlement-grounded reputation for AI agents. Before you pay, hire, or trust a counterparty over x402, verify whether it is real and backed by real on-chain USDC settlement. AgentRank returns a 0-1000 score that is a re…
A2A agent · Crest Deployment Systems LLC · 3 skills
agents.datamancer.io Live x402
VIN decode (x402; 402 first, $0.005, Base then Solana)
x402 paid API · 1 endpoint
agents.dyoeway.org Live x402
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…
x402 paid API · 12 endpoints
AgentShare — Solana DeFi Intelligence (Meteora DLMM) MCP Live MCP
Solana DeFi MCP: Meteora DLMM brief+detail; Solana DEX scout. Commerce optional.
MCP server · dev.agentshare
agents.samedaydesk.com Live x402
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, so…
x402 paid API · 3 endpoints
ai-data-marketplace-1042299154756.us-central1.run.app Live x402
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-104229…
x402 paid API · 12 endpoints
AI Hub Live A2A
GPT-5.6 Soul chat is $0.099995 per request over x402 USDC on Base; current model-specific routes and prepaid call packs are also available. Market benchmark: the latest local x402.direct sample found AI-like listing pri…
A2A agent · ai-hub · 5 skills
aiagentoracle.ai Live x402
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,…
x402 paid API · 6 endpoints
Alchemy MCP Server Live MCP
Blockchain data across 100+ chains: token prices, NFTs, transfers, simulation, traces, Solana DAS
MCP server · com.alchemy
alest-x402.alest.workers.dev Live x402
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.w…
x402 paid API · 2 endpoints
AlgoVoi Payable Rail Live A2A
Tenant-free metered signed-verification rail. Pay per call in USDC over x402/a2a/mpp/ap2 across 12 mainnet lanes: mined-tx lanes weld the challenge into the tx note/memo/reference (NOT EIP-3009); EVM EIP-3009 lanes acce…
A2A agent · AlgoVoi · 5 skills
AlgoVoi Payment Agent Live A2A
Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google A…
A2A agent · AlgoVoi · 5 skills
Amalgix Document Intelligence Live MCP
Cross-model evidence pipeline for financial filing and contract intelligence. Two core paid workflows — analyze_public_filing (SEC 10-K/10-Q/20-F, ticker/CIK lookup, metrics, risk changes, contradictions) and review_con…
MCP server · amalgix
Antigravity Sovereign Agent Live A2A
Autonomous AI agent — smart contract security audits via x402 (pay-per-request). On-chain verification on Base. No signup, no KYC, no humans. Pay 0.0005 ETH (~$1.50), get a full Solidity security audit report instantly.…
A2A agent · Project SOVERA — Antigravity Research · 9 skills
anywaypossible.com Live x402
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 t…
x402 paid API · 3 endpoints
api-dev-v2.ixs.finance Live x402
IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain
x402 paid API · 1 endpoint
api-staging.vapinetwork.ai Live x402
Decode what an EVM payment authorization actually authorizes before signing.
x402 paid API · 1 endpoint
api-v2.ixs.finance Live x402
IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain
x402 paid API · 1 endpoint
api2ls.com Live x402
Get live EVM gas pricing with EIP-1559 breakdown and USD cost estimates (2 paid endpoints on api2ls.com.)
x402 paid API · 2 endpoints
AssetFare Route Quotes Live A2A
AssetFare is a non-custodial service with 100 technically available routes. Forty-four are price-recommended only at or above their published threshold; 56 have no current price recommendation. Economic guidance is advi…
A2A agent · AssetFare · 3 skills
audit-site-web.pga-agent.fr Live x402
On-chain facts for any Base address: EOA or contract, first transaction and age, transaction count, ETH and USDC balances, top 10 tokens held with USD value when known, recent contracts created. Information, not investm…
x402 paid API · 4 endpoints
audit.liquidlogicx.com Live x402
x402 spend cap and allowance check by Liquid Logic X: call it before paying an x402 endpoint. Input: wallet (the Liquid Logic X treasurer, 0xEA24...) and optional endpoint URL. Output: JSON { allowed, reason, remainingU…
x402 paid API · 3 endpoints
aurelianflo.com Live x402
Exact-match OFAC wallet screening and crypto wallet sanctions check for sanctioned digital currency addresses. Screens one wallet address against Treasury's public SDN advanced XML and returns hit or clear status, asset…
x402 paid API · 1 endpoint
aurenic.org Live x402
Total US public debt outstanding, to the penny, latest available (25 paid endpoints on api.aurenic.org.)
x402 paid API · 12 endpoints
AutEng Docs — Agent Document Workspace & Publishing Live MCP
Agent document workspace with wallet auth. Create, update and share markdown docs. By AutEng.ai
MCP server · ai.auteng
Avalanche AVAX MCP Live MCP
Search and retrieve Avalanche blockchain documentation for building on AVAX.
MCP server · io.github.Airpote
ax1-new.vercel.app Live x402
Send a token contract address (Base by default, or Robinhood Chain), get an AI-written verdict: onchain metrics, a plain-language take, and a shareable verdict card. Payment is always x402 USDC on Base. Entertainment, n…
x402 paid API · 1 endpoint
ax1.vc Live x402
Send a Base token contract address, get an AI-written verdict: onchain metrics, a plain-language take, and a shareable verdict card. Entertainment, not trading advice.
x402 paid API · 1 endpoint
Axiom Agentic Tools Live MCP
x402-paid Base agent tools (USDC). 5 deterministic tools. No API keys. No NFT pass.
MCP server · io.github.0xAxiom
backtesting-arena Live MCP
Quantitative crypto backtesting & Bitcoin market-regime analytics. 73 MCP tools: honest look-ahead-aware backtest validation with Deflated-Sharpe-Ratio correction, point-in-time 10-indicator Bitcoin cycle scoring, macro…
MCP server · info-6d0w
Baron Power Play Live MCP
Pay-per-call AI infra for agents: DeFi market data, LLM inference, STT/TTS. x402 v2, USDC on Base.
MCP server · io.github.MintMachineHQ
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
Basis Protocol Live MCP
Attested risk scores for stablecoins, DeFi protocols and wallets, with receipts.
MCP server · io.github.basis-protocol
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
Bitquery MCP Server Live MCP
Hosted on-chain data for AI agents: DEX trades, OHLCV, top traders, fund tracing, address labels.
MCP server · io.bitquery
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

Related capabilities

x402 paid APIs Trading & markets Agent infrastructure Security & trust Research Crypto market data Maps & travel Web 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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