AgentBIT

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)

Risk, security & compliance

Web & research

Business & finance

Infrastructure & DevOps

x402 ecosystem tooling

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.