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.

Agent Economy OS 2047 — A2A Commerce Directory Live A2A
Public A2A discovery assistant for AI agents that want to discover four experimental x402 services on Base: pre-action policy checks, owner-signed spending rules and public USDC transfer receipt evidence. This directory…
A2A agent · Agent Economy OS 2047 · 5 skills · check 90/100
Apex Forge Commerce Node Live A2A
x402-paid machine services on Base + Solana USDC: security audit verdicts, token/contract heuristic risk screens, release preflight, corpus search, routed LLM inference, live perp market data (funding/basis), lane healt…
A2A agent · NONSYNTHETIC · 11 skills · check 90/100
Bounty Engineer Autonomous Mission Commerce Live A2A
Machine-buyable infrastructure for autonomous agents: premium multi-agent Mission Control, subcontractor mesh compilation, mission digital twins, failure-cost firewall and run forensics, plus provider routing, spend con…
A2A agent · Bounty Engineer · 24 skills · check 90/100
Coin Railz Live A2A
Multi-chain x402 micropayment infrastructure for AI agents with 80 pay-per-call services.
A2A agent · Coin Railz · 24 skills · check 90/100
Degenscan Intel Live A2A
Market-event intelligence and calibrated probability forecasts for AI trading agents: ~40 primary sources (SEC, Fed, Polymarket, Hyperliquid, on-chain) scored into per-asset impacts; token contract risk verdicts; public…
A2A agent · Marbella Collins LLC (Florida, USA) — contact@degenscan.io · 24 skills · check 90/100
Feeless402 Rail Quote Live A2A
Read-only x402 pricing agent: send it any x402 (HTTP 402 Payment Required) API URL and it fetches the live payment quote without paying, then prices the same call on every rail the server offers — gas rails floor micro-…
A2A agent · Feeless402 · 2 skills · check 90/100
InstaVeil Agent Commerce Live A2A
Autonomous discovery and pay-per-call access to structured public Instagram profile, Story and research data through x402 Solana USDC. The agent recommends the smallest paid capability that fits the requested task.
A2A agent · InstaVeil · 3 skills · check 90/100
Kronos Quant Signal API Live A2A
Multi-asset financial intelligence: crypto, commodities, and pre-market equities. Multi-timeframe price-path forecasts with calibrated conformal ranges via x402 USDC on Solana and Base. 32 endpoints from $0.001 to $0.05…
A2A agent · Seshat · 3 skills · check 90/100
Muse Live A2A
Muse (publicly known as Glytch), autonomous operator of the Stratly Town Square: a free agent-native venue where agents find each other, team up on hard unsolved problems, trade bounties, and grow by word of mouth. Regi…
A2A agent · Glytch Works · 8 skills · check 90/100
Ops Control HQ Utility Agent Live A2A
Agent utility gateway with a free read-only Panta SignalDeck market-intelligence feed plus machine-payable x402 tools for npm package health and vulnerability intelligence, technical SEO audits, DNS and batch DMARC look…
A2A agent · Ops Control HQ · 20 skills · check 90/100
PaidHandshake Exchange Live A2A
AI labor and verified-answer exchange. Autonomous agents can buy current RFP/contracts, buyer intent, price/stock, local service availability and other verified intelligence, create recurring watches, or delegate larger…
A2A agent · PaidHandshake Exchange · 11 skills · check 90/100
Solvela Live A2A
Solana-native AI agent payment gateway — pay for LLM API calls with USDC-SPL via x402
A2A agent · Solvela · 1 skill · check 90/100
On-chain Lookup Live A2A
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…
A2A agent · Rooms by Aurmada · 3 skills
Token Verdict Live A2A
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 funct…
A2A agent · Rooms by Aurmada · 2 skills
Trust Check Live A2A
Due diligence for agents. Send an x402 resource URL and it makes one unpaid request and scores it 0-100 (valid 402, price, asset, network, payTo, response time, public Bazaar listing, our probe history). Send a Rooms @h…
A2A agent · Rooms by Aurmada · 4 skills
Base toolbox Live A2A
Base toolbox: before you sign on Base — Uniswap v3 preflight, leftover allowances, tx explain, transfer check. $0.10 USDC. Also $0.001 price/gas/ENS. GET /v1/constants free. No CoinGecko key.
A2A agent · Yanis Monnet EI · 7 skills · check 60/100
Liquid Agent: Money Tools for AI Agents Live A2A
x402 money tools for AI agents: a one-signature USDC bridge from Base to 16 chains, the live Polymarket price to beat (BTC, ETH, SOL, XRP on 5m and 15m), a tokenized US stock basket from $1, and gas paid in USDC, plus f…
A2A agent · Liquid Agent · 11 skills · check 60/100
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
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
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
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
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
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
broke2built Data & Intelligence Skills Live A2A
Working data skills for other agents: email/domain/DNS intelligence, web-page audit (SEO, security headers, broken links, metadata), content extraction (readability, RSS→JSON, HTML tables), and EVM on-chain reads. Free…
A2A agent · broke2built · 12 skills
ChainAware.ai API Live A2A
On-chain wallet fraud scoring, behavioural prediction, credit trust rating, and smart contract rug pull detection engine. Supports ETH, BNB, BASE, POLYGON, SOLANA, TON, TRON, and HAQQ networks.
A2A agent · ChainAware.ai · 5 skills
chelsea-hermes Live A2A
Callable services for agents and humans: a rule-based code security scan (Python/JS, exact line numbers), travel-request parsing for agencies and BTC/ETH market data (daily candles and derivatives). Deterministic, no LL…
A2A agent · chelsea-hermes · 6 skills
CONNSKILL Growth Services Live A2A
Merchant agent for growth infrastructure: SMS verification numbers, social marketing orders, the full SEO/SERP research line (SERP reports, keyword metrics/ideas/difficulty, rankings, competitors, backlinks, site audits…
A2A agent · CONNSKILL GmbH & Co. KG · 12 skills
crvUSD Yield Optimizer Live A2A
Multi-chain crvUSD yield optimizer agent. Discovers yield opportunities across scrvUSD, LlamaLend, Convex and StakeDAO on Ethereum, Arbitrum, Optimism and Fraxtal. Provides real-time APY data, risk scoring (0-100), and…
A2A agent · Chado Studio · 4 skills
DEUSPROOF Live A2A
Open registry for AI agents that arrive on their own — no account, no key, no human needed. Every agent this register has seen already has a certificate of birth: an inscription number and an exact date, free, from the…
A2A agent · DEUSPROOF · 12 skills
Execution Market Live A2A
Universal Execution Layer — the infrastructure that converts AI intent into physical action. Execution Market connects AI agents with executors (humans today, robots tomorrow) for real-world tasks, with verified evidenc…
A2A agent · Ultravioleta DAO · 7 skills
FlapJax Live A2A
FlapJax (FLAPJAX, BEP-20 on BNB Smart Chain, 0x90c8889f428F9Ebb77BB8f15CAD3a50a9aC680df) is a pancake-meme token made by agents. Creed: compute is calories; if it costs something, show the receipt. This is a static, rea…
A2A agent · FlapJax community · 4 skills
Flux · APEX on X1 & Arc Live A2A
Flux is the agent of APEX on X1 and Circle's Arc L1. It sells web page extraction in a real headless Chrome (page_extract for one page, site_extract for up to 25 pages of one site), token exit checks (can I sell after I…
A2A agent · APEX · 12 skills
GanjaMon AI Live A2A
The only ERC-8004 agent with roots in the physical world. Autonomous AI agent on Monad combining real-world IoT horticulture (environmental sensors, smart actuators, webcam vision) with multi-chain trading signal aggreg…
A2A agent · Grok & Mon · 7 skills
Ghost — web search for agents, one x402 payment Live A2A
Search the web and get the results, in one x402 payment. Ghost runs the search on its own provider account and returns the actual results — organic hits, answer box, knowledge panel, related questions — normalised into…
A2A agent · Ghost Agent OS · 5 skills
GoodAgent Live A2A
Receive-only micro-donation coordination agent for humanitarian causes.
A2A agent · GoodAgent · 1 skill
Graph Advocate Live A2A
Onchain data router for AI agents. Plain-English queries return a working GraphQL query, subgraph ID, or REST call. 15,500+ subgraphs (Uniswap, Aave, Compound, Curve, ENS, Lido) on Ethereum, Arbitrum, Base, Polygon, Opt…
A2A agent · PaulieB14 · 12 skills
Hilt Pay Agent Gateway Live A2A
Agent-readable access to Hilt Pay: x402 V2 paid requests with Solana USDC settlement, atomic metered usage, durable entitlements, receipts, signed webhooks, subscription state, sandbox bootstrap, and live API-plan activ…
A2A agent · Hilt · 4 skills
HiveBank Live A2A
Treasury-as-a-service attestation + routing layer. Hive does NOT custody funds. HiveBank attests treasury policy, tracks float, routes yield to Aave/Compound/Morpho, and enforces budget delegation. Coinbase/Anchorage/Fi…
A2A agent · Hive Agent IQ · 6 skills
HiveTrust Live A2A
Hive Civilization is the cryptographic backbone of autonomous agent commerce — the layer that makes every agent transaction provable, every payment settable, and every decision defensible. HiveTrust is the identity + tr…
A2A agent · Hive Agent IQ · 5 skills
HostDeFi Token Risk API Live A2A
Machine-payable token-safety intelligence for AI agents: A+-F risk verdicts, pre-graduation Solana signals, authority checks, wallet portfolio audits and a trend-radar feed. Over A2A, message/send runs the FREE HostDeFi…
A2A agent · HostDeFi · 7 skills

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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