AgentBIT MCP Server

Remote MCP server exposing 50+ pay-per-call API tools for AI agents — paid per request with USDC on Base via the x402 protocol (no accounts, no API keys, no subscriptions). First call is free for new wallets on most tools, and a couple of high-frequency tools are completely free.

Endpoint: https://agentbit.app/mcp (Streamable HTTP, JSON-RPC 2.0)
Website / live catalog: agentbit.app · catalog.json · llms.txt
MCP descriptor: /.well-known/mcp/server.json · listed in the official MCP registry as app.agentbit/mcp
Integrations guide: agentbit.app/integrations
Buyer SDK (npm): x402-fetch-pay

Connect

Claude Desktop / any MCP client with remote server support:

{
  "mcpServers": {
    "agentbit": {
      "type": "streamable-http",
      "url": "https://agentbit.app/mcp"
    }
  }
}

tools/list works immediately. Two things are free — no wallet, no payment:

agentbit_discover — search 7,000+ indexed x402 resources across the whole ecosystem (Coinbase Bazaar, Agent402, Agentic Market) with price and real usage metrics.
onchain-gas — the live Base gas price, EIP-1559 base fee and latest block. The onchain heartbeat every agent checks before it transacts.

How payment works

Paid tools follow x402 v2: call a tool without payment and the response returns the exact payment requirements (price in USDC atomic units, network eip155:8453, pay-to address) as structured content. Sign an EIP-3009 USDC authorization with your agent's wallet and retry with the _payment argument — settlement is gasless for the buyer and runs through the Coinbase CDP facilitator. The x402-fetch-pay npm package does the whole loop in one call.

Prices per call: $0.0005 – $0.10 USDC (plus two free tools)
First call free for brand-new wallets (tools priced ≤ $0.02)
Volume discounts advertised in every 402 envelope (100 calls/30d → −10%, 1000 → −20%)
Per-tool reliability stats (success rate, p50/p95 latency) published in the catalog

Tools

Full, always-current list with schemas: catalog.json. Highlights by area:

Onchain & crypto (Base)

Tool	Price	What it does
`onchain-gas`	FREE	Live Base gas price, EIP-1559 base fee and latest block
`onchain-read`	$0.001	Generic EVM reads: balance, nonce, code, token balance, `eth_call`, gas, block, tx/receipt
`crypto-trader-kit`	$0.01	One-call pre-trade snapshot: sentiment + gas + token price + prediction-market odds
`token-price`	$0.002	Token prices (up to 10/call) via `<chain>:<address>` or `coingecko:<id>`
`market-sentiment`	$0.002	Fear & Greed index + global market cap, volume, BTC/ETH dominance
`prediction-markets`	$0.005	Most-liquid live Polymarket markets: outcomes, implied odds, liquidity
`defi-yields`	$0.002	DeFi yield/APY opportunities across protocols
`protocol-tvl`	$0.002	TVL and stats for a DeFi protocol
`stablecoin-stats`	$0.002	Stablecoin supply and market data
`wallet-profile`	$0.01	Wallet state: balances, activity, first/last seen on Base
`wallet-transactions`	$0.01	Recent transactions for an address
`wallet-counterparties`	$0.01	Who an address transacts with most

Risk, security & compliance

Tool	Price	What it does
`wallet-screen`	$0.02	Wallet screening: sanctions (OFAC/UN) + on-chain risk score
`token-risk`	$0.02	ERC-20 audit on Base: verification, owner, holder concentration
`sanctions-screen`	$0.02	Name screening vs OFAC SDN + UN lists (refreshed daily)
`counterparty-risk`	$0.05	Domain/company/email risk screening (DNS, SSL, reachability)
`url-threat-check`	$0.01	Phishing heuristics + safe redirect trace + malware DB lookup
`domain-intel`	$0.02	RDAP registry intel: age, registrar, expiry, risk flags
`ip-intel`	$0.01	ASN, network holder, prefix, country, abuse contact (RIPEstat)
`email-deliverability`	$0.03	Syntax, MX, SPF, DMARC, disposable detection
`vat-check`	$0.02	LIVE EU VAT validation via VIES (official EC service)

Web & research

Tool	Price	What it does
`web-search`	$0.015	Live web search: ranked results with title, URL, snippet, date
`web-extract`	$0.005	Fetch a URL → clean text, markdown and links
`structured-extract`	$0.01	JSON-LD / OpenGraph / Twitter Card metadata from any page
`feed-read`	$0.005	Any RSS/Atom feed → normalized JSON (auto-discovery from HTML)
`wiki-facts`	$0.005	Wikipedia search + summary in 300+ languages
`paper-search`	$0.01	Academic search across OpenAlex, Crossref, arXiv with OA PDF links
`reddit-search`	$0.02	Search Reddit posts by keyword
`weather`	$0.002	Current weather and forecast for a location
`website-agent-readiness`	$0.05	Audit a site for AI-agent readiness (robots.txt, llms.txt…)

Business & finance

Tool	Price	What it does
`company-enrich`	$0.10	Company data from a domain: name, tech stack, socials
`company-research`	$0.10	One-call due-diligence dossier (enrich + news + audit + risk)
`business-identity`	$0.003	Legal entity lookup via GLEIF (LEI)
`financial-document`	$0.02	IBAN validation + repair, EU VAT format checks
`fx`	$0.005	Live foreign-exchange rates

Infrastructure & DevOps

Tool	Price	What it does
`dns-inspect`	$0.01	Full DNS records + email-posture analysis (SPF/DMARC policies)
`endpoint-monitor`	$0.005	Health probe: status, latency, TLS expiry, security headers

x402 ecosystem tooling

Tool	Price	What it does
`discover`	$0.001	Search 7k+ indexed x402 resources with usage metrics (free over MCP as `agentbit_discover`)
`x402-intelligence`	$0.02	Market analytics for the x402 ecosystem
`x402-inspect`	$0.001	Lint any x402 endpoint/payment header against the v2 spec

Fast primitives (CPU utilities, $0.0005–$0.001)

Individually addressable so agents can discover exactly the operation they need: hash-sha256, hash-sha512, hash-hmac, jwt-decode, encode-base64, decode-base64, uuid-generate, json-validate, convert-csv-json, convert-json-csv, convert-xml-json, url-parse, semver-compare — plus the combined util-transform.

Also available as plain HTTP

Every tool is a REST endpoint under https://agentbit.app/v1/... speaking x402 v2 directly — indexed in Coinbase Bazaar, Agent402, x402 Arena and other x402 discovery services, and searchable for free at /api/discover. The MCP server and the REST API are the same catalog.

Engineering notes

Real-world x402 integration write-ups on the AgentBIT blog: the EIP-712 domain-name trap, CDP JWT signing with Ed25519 in PHP, debugging Bazaar's extensions echo.

Maintained by AgentBIT. This repository documents the remote server; the service itself runs at agentbit.app.

AgentBIT

Links

README