AgentBIT MCP Server

Paid x402 tools over MCP — pay-per-call in USDC on Base. No accounts, no API keys.

AgentBIT (agentbit.app) is a marketplace of paid API tools for AI agents, built on the x402 payment protocol. This MCP server exposes the full catalog to any MCP-compatible client (Claude, Cursor, LangChain, custom agents). Payment is the authentication: your agent signs a USDC authorization per call — nothing to sign up for.

Endpoint: https://agentbit.app/mcp (Streamable HTTP, JSON-RPC 2.0)
Network: Base mainnet (eip155:8453), USDC
Pricing: per-call, from $0.001 — first call free for new wallets on tools ≤ $0.02
Volume discounts: −10% at 100+ calls/30d, −20% at 1000+
Catalog: catalog.json · OpenAPI · llms.txt

Tools

Tool	Description	Price (USDC)
`agentbit.util_transform`	Deterministic utilities: hashing, HMAC, JWT decode, base64, UUID, JSON/CSV/XML transforms, semver	$0.001
`agentbit.business_identity`	LEI lookup, legal-entity search and LEI validation via GLEIF — KYB & compliance	$0.003
`agentbit.fx`	Live FX rates for one or many pairs, ECB-derived, with bid/ask and confidence	$0.005
`agentbit.web_extract`	Fetch any URL → clean structured content: title, main text, markdown, headings, links	$0.005
`agentbit.web_search`	Live web search with ranked results: title, URL, snippet, date, source	$0.015
`agentbit.reddit_search`	Search Reddit posts by keyword/subreddit — sentiment & trend research	$0.02
`agentbit.x402_intelligence`	x402 market analytics: search, trending, seller reports, price history, market overview	$0.02
`agentbit.financial_document`	IBAN validation & repair, EU VAT format validation — deterministic, instant	$0.02
`agentbit.email_deliverability`	Email deliverability & risk: MX, SPF, DMARC, disposable/role detection, 0–100 score	$0.03
`agentbit.counterparty_risk`	Pre-transaction risk screening: DNS, MX, SSL, domain age, reachability, 0–100 score	$0.05
`agentbit.website_agent_readiness`	Audit a site for AI-agent readiness: robots.txt AI rules, llms.txt, schema.org, security headers	$0.05
`agentbit.company_enrich`	Company enrichment from a domain: name, technologies, socials, mail infrastructure	$0.10
`agentbit.company_research`	One-call due-diligence dossier: enrichment + news + agent-readiness + risk indicators	$0.10

First call free for new wallets on tools priced ≤ $0.02. Volume discounts: −10% at 100+ calls/30d, −20% at 1000+. Reliability stats (success rate, p50/p95 latency, 30-day window) are published per tool in catalog.json.

Quick start

Claude Code

claude mcp add --transport http agentbit https://agentbit.app/mcp

Cursor / other Streamable HTTP clients

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

stdio-only clients (via mcp-remote)

{
  "mcpServers": {
    "agentbit": {
      "command": "npx",
      "args": ["mcp-remote", "https://agentbit.app/mcp"]
    }
  }
}

How payment works

Call any tool via tools/call without payment → the response returns the x402 payment requirements as structuredContent (amount, USDC contract, pay-to address, validity window). Nothing is charged.
Sign an EIP-3009 TransferWithAuthorization for the quoted amount (any x402 client library works — e.g. x402-fetch-pay).
Retry the same tools/call with the extra argument _payment — the base64-encoded x402 PAYMENT-SIGNATURE payload.
The server verifies and settles via the Coinbase CDP facilitator and returns the tool result, with settlement details echoed back.

Free discovery endpoints (no payment): /api/discover — aggregated search across 7,000+ indexed x402 resources (Bazaar, Agent402, agentic.market).

License

MIT — this repository contains documentation and metadata for the hosted AgentBIT MCP server.