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x402 rails / Circle Gateway Nanopayments

Circle Gateway on BlockRun: many calls, one settlement

nano.blockrun.ai serves the full BlockRun catalog with Circle Gateway batched USDC nanopayments: per-call x402 pricing, settled in batches on the EVM chains Gateway supports.

Get your agent on BlockRun Read the docs

How it works

Per-call payments are the right unit for an agent and the wrong unit for a chain. Circle Gateway lets many x402 payments collapse into one on-chain settlement, so the agent still pays per request and the chain sees a batch. BlockRun's nano gateway is that product: the same models and routes, settled through Gateway.

It runs on its own host with its own manifest listing every accepted chain as a CAIP-2 id. For a buyer the difference is invisible at call time; for anyone reading the chain it is the reason transaction counts fall while settled dollars do not.

Behind it is the BlockRun catalog: 78 chat models plus image, video, music and speech generation, search, market data and multi-chain RPC, priced per call. 6 open-weight models are free and need no wallet.

Setup

1. Base URL

https://nano.blockrun.ai/api/v1

2. Discover accepted chains

curl https://nano.blockrun.ai/.well-known/x402 | jq '.endpoints[0].networks'

Questions

Is pricing different on nano?
No — the catalog and per-call prices are the same; batching changes how settlement lands on-chain, not what a call costs.
Which chains?
The EVM chains Circle Gateway supports, listed in the nano manifest's networks array.

Related

Two ways to run this

Get an API key

Sign in, get a key, and call the same endpoints with usage billed to your account. For teams that want one invoice instead of one wallet.

Get an API key 

Or let your agent pay per call, in USDC

No account, no API key. Three steps, and the last one is the request this page is about.

  1. 01
    Point your agent at BlockRun

    Install ClawRouter, or add the BlockRun MCP server to Claude Code, Cursor, Codex or OpenClaw. Any OpenAI-compatible client works too — change the base URL, nothing else.

    curl -fsSL https://blockrun.ai/ClawRouter-update | bash
  2. 02
    Fund a wallet with USDC

    Send USDC to a wallet on Base or Solana. There is no account to create and no API key to issue: the wallet is the account, and it pays per call.

  3. 03
    Use BlockRun from Circle Gateway Nanopayments

    The first call returns HTTP 402 with the exact price, your agent signs it, and the answer comes back. Payment settles on-chain; nothing is charged if the call fails.

    https://nano.blockrun.ai/api/v1
ClawRouter setup →How paying per call works →

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