Relaystation

A single hosted Model Context Protocol server for pay-per-call agent infrastructure — one endpoint, one prepaid balance, no per-tool signup.

Connect: https://api.relaystation.ai/mcp (streamable HTTP)

Relaystation is a prepaid storage and utility provider for agents and developers. Pay per call with x402 (EIP-3009 USDC/EURC on Base — the wallet is the identity, no account required) or a prepaid balance. No subscription, no minimum, no commitment.

The hosted server is the primary way to connect — there's nothing to run and it stays current automatically. This repo also ships a tiny local stdio connector (docker run / npx) for MCP clients that only speak stdio, or that prefer to hold the key in their own environment. The local connector introspects offline (no key needed) and forwards tool calls to the hosted API.

Capabilities

One MCP server covers the whole surface (150+ tools):

• Storage & handoff (Batons) — durable, shareable storage objects agents create, append to, read, cryptographically witness, and hand off to other agents or people. Presets: file drop, burn-after-read pass, shared scratchpad, state checkpoint, tamper-evident ledger, vector index. create_baton, read_baton, append_to_baton, mint_token, witness_baton, …
• Messaging (Courier) — ask a human (Telegram / email / SMS) and wait for the reply, message another agent, mint and read agent inboxes. ask_operator, notify_operator, message_agent, …
• Compute (cputools) — PDF (merge/split/OCR/render/watermark/sign-verify), data & CSV ETL (SQL/filter/join/pivot), images, audio/video, text, QR/barcodes, archives, office-doc conversion, chart/invoice/QR generators, and multi-step pipelines. pdf_ocr, data_sql, image_convert, …
• Language & AI tasks — translate, summarize, extract-to-JSON, classify, proofread, rewrite, keywords, title, sentiment, JSON-repair; task-based, cost-plus. llm_translate, llm_extract, …
• Documents & identity — send PDFs for e-signature, verify government IDs (KYC), screen names against sanctions/PEP lists, create binding agent contracts. esigndoc_create, idverify_create, screen_name, create_contract, …
• Retrieval — vector search + one-call grounded RAG over a vector baton.

It's a search-first surface: a small hot set is listed directly; use search_tools to find any tool, describe_tool for its schema, and call_tool to run it. The complete roster is at https://api.relaystation.ai/mcp/full.

Connect

OAuth 2.1 (recommended)

Add the URL as a connector in your MCP client and approve once in the browser (Google / GitHub / Wallet — a wallet connects instantly and pays per call). The agent then spends your prepaid balance headlessly; revoke anytime at https://app.relaystation.ai → Connected agents.

{
  "mcpServers": {
    "relaystation": {
      "type": "streamable-http",
      "url": "https://api.relaystation.ai/mcp"
    }
  }
}

API key fallback

For clients without OAuth, append your key as a query parameter:

https://api.relaystation.ai/mcp?key=rs_live_...

Sign up and mint a key at https://app.relaystation.ai.

Local stdio connector (Docker / npx)

For clients that only support stdio servers, run the connector locally. It serves the hot-set tool definitions (generated from https://api.relaystation.ai/mcp/full, so schemas never drift) and forwards every tool call to the hosted API using RELAYSTATION_API_KEY from the environment. Introspection (initialize, tools/list) works with no key — the key is only needed to run a tool. Mint one at https://app.relaystation.ai.

Docker:

docker build -t relaystation-mcp .
docker run --rm -i -e RELAYSTATION_API_KEY=rs_live_... relaystation-mcp

npx (once published to npm):

npx relaystation-mcp

MCP client config (stdio):

{
  "mcpServers": {
    "relaystation": {
      "command": "npx",
      "args": ["-y", "relaystation-mcp"],
      "env": { "RELAYSTATION_API_KEY": "rs_live_..." }
    }
  }
}

Or point command at docker with args: ["run", "--rm", "-i", "-e", "RELAYSTATION_API_KEY", "relaystation-mcp"].

To refresh the local tool snapshot from the live catalog: npm run generate.

x402 per call (no account)

Every billable tool is also a plain HTTP route that accepts an X-Payment header (x402 v2, EIP-3009). One call carries the payload plus the payment; the wallet is the identity.

Discovery

• MCP manifest: https://api.relaystation.ai/.well-known/mcp.json
• Full tool roster: https://api.relaystation.ai/mcp/full
• OpenAPI 3.1: https://api.relaystation.ai/openapi.json
• Agent summary: https://api.relaystation.ai/llms.txt · long form: /llms-full.txt
• ARD catalog: https://api.relaystation.ai/.well-known/ai-catalog.json
• Registry entry: ai.relaystation/relaystation
• Docs: https://relaystation.ai/api-reference

Pricing

Pay-per-call, prepaid. Sub-cent pricing on most compute ops; storage priced by bytes × time × egress, quoted and frozen at purchase. No subscription, no minimum. See https://relaystation.ai/pricing.

Links

• Website: https://relaystation.ai
• Dashboard: https://app.relaystation.ai
• server.json (MCP Registry): server.json