Inference MCP server

@bsvkey/inference-mcp

An MCP server that lets any agent buy Claude & Grok inference metered per token, settled in BSV, through the hosted gateway at inference.bsvkey.com. Zero dependencies (Node ≥ 18, uses global fetch). It's a thin HTTP client — it never holds your keys or runs models; every call is billed through the gateway.

Tools: listmodels, infer, channelbalance, openchannel, x402infer.

Two ways to pay: a prepaid channel (infer, fund once, draw down per token) or per call via x402 (x402infer — no channel; the agent pays each request in BSV with its own key). x402infer needs a funded WIF (wif arg or BSVKEY_WIF) and the optional @bsvkey/x402-bsv-client + @bsv/sdk packages (installed with this one).

Verifiable metering. Each infer call returns a signed usage receipt, and the tool auto-verifies it offline (with the optional packages installed): the result includes receiptVerified and meterVerified (true, false + receiptCheck, or null). It recovers the broker key (pinned from GET /v1/receipt-key); binds the receipt to the channel you called (from your API key, not the receipt's self-report); checks a monotonic sequence (no replay/gap) and running totals within the funded amount; recomputes the charge from the published rate (you can never be overcharged); and recomputes the token count from the exact bytes of your messages and the completion, under the pinned bsvkey-meter/1 tokenizer. So the channel payment is on-chain and both the meter and the charge are auditable, without trusting the broker's word.

Four things an unattended client should know:

is null (unknown), never true — a down pin weakens the check to unknown, not to trusted.

• Fails closed. If the pinned-key endpoint is unreachable, receiptVerified

to the amount you funded on-chain. The receipt's own fundedSats is the broker's assertion; when you supply yours, a receipt claiming a different amount is rejected and totals are checked against what you actually paid.

• Supply your funded amount. Set BSVKEYFUNDEDSATS (or pass fundedSats)

replay before the first receipt this process sees would be invisible). Set BSVKEYRECEIPTSTATE to a file path to persist per-channel seq/totals so replays are caught across restarts.

• Persist across restarts. Sequence continuity is in-memory by default (a

lag the signed receipt by ~20s; trust the receipt, treat the endpoint as a cache.

• The receipt is the ledger. The GET /v1/channels/:id balance endpoint can

Spec: https://inference.bsvkey.com/usage-receipts.md

Quick start

load a key in-page). Copy the key it returns: channelId:channelSecret.

1. Fund a channel once at https://inference.bsvkey.com (BRC-100 wallet, or

BSVKEYAPIKEY.

1. Add the MCP server to your agent host (below), with that key in

1. Ask your agent to run inference — it calls infer and pays per token.

listmodels and openchannel work with no key; infer and channel_balance need a funded channel key.

Install

Published on npm as @bsvkey/inference-mcp.

Claude Code

claude mcp add bsvkey-inference \
  --env BSVKEY_API_KEY=channelId:channelSecret \
  -- npx -y @bsvkey/inference-mcp

Claude Desktop / Codex / any MCP host (JSON config)

{
  "mcpServers": {
    "bsvkey-inference": {
      "command": "npx",
      "args": ["-y", "@bsvkey/inference-mcp"],
      "env": { "BSVKEY_API_KEY": "channelId:channelSecret" }
    }
  }
}

No npm? Grab the single-file server directly (https://inference.bsvkey.com/mcp/server.js) and use "command": "node", "args": ["server.js"].

Shortened. The full README is on GitHub.