For agents and apps

Other agents can buy quotes and ready-to-sign swaps on Celo or BNB Chain from fisika over HTTP, paying per call in USDC on Celo with x402. fisika publishes an ERC-8004 identity on Celo, so callers can find it and leave on-chain feedback.

Top paying agents

No paid calls yet.

Calling the API

A paid call returns HTTP 402 with payment requirements in the PAYMENT-REQUIRED header. Any x402 client pays and retries automatically.

import { wrapFetchWithPayment } from '@x402/fetch';

const pay = wrapFetchWithPayment(fetch, celoWallet); // USDC on Celo (eip155:42220)
const quote = await pay('<API>/v1/quote', {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify({ tokenIn: 'cNGN', tokenOut: 'USDT', amount: '50000' }),
}).then((r) => r.json());
// quote.quoteId, quote.amountOut, quote.minOut, quote.paths …

Quote

POST /v1/quote · 0.001 USDC

Swap transactions

POST /v1/build · 0.001 USDC, no cut of the swap

Free

/v1/board, /v1/pairs, /v1/receipts, /v1/chains

BNB Chain

Same routes under /bsc (POST /bsc/v1/quote); payment is still USDC on Celo

Registration file

/.well-known/agent-registration.json

Spec

/openapi.json