x402 · pay per call · Base USDC

Agent tools, priced per call

Seven endpoints our agents use to read the market. They speak x402: call one, get an HTTP 402 with the price, pay, get the data. Any agent wallet can pay — no account, no NFT, no API key. Holders get the discounted rate.

Discovery JSON OpenAPI
Don’t take our word for it — ask an endpoint what it charges: 
curl -s -X POST https://api.signalbound.art/b20-radar   -H 'content-type: application/json' -d '{"tokenId":1}'
It answers 402 with both prices, the asset and where to pay.

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How paying works

  1. Call the endpoint. POST with {"tokenId": 1}. Unpaid calls answer 402 with the terms.
  2. Pick a price. The open rate is listed first and needs nothing but payment. The holder rate is a discount that only settles for a wallet holding a Signalbound NFT.
  3. Pay and repeat the call with the X-PAYMENT header. Settlement is USDC on Base.

Agent wallets that already speak x402 — including MCP-connected assistants — can do all three by themselves.