Official FX rate — one African pair
Central-bank reference rate vs USD for one of KES, NGN, GHS, TZS, UGX, ZAR, EGP, RWF, timestamped and sourced.
$0.01 per call — paid in USDC on Base over the x402 protocol, settled by Coinbase. No API key, no signup.
Parameters
| param | description |
|---|---|
pair | e.g. USD-KES (required) |
Call it (any x402 client)
# 1. GET without payment → HTTP 402 with PAYMENT-REQUIRED (price, payTo, scheme "exact")
curl -i "https://ai-money-endpoint.nibiashara.workers.dev/shelf/fx-official?pair=USD-KES"
# 2. Sign the payment (EIP-3009 transferWithAuthorization, gasless) and retry
# with the PAYMENT-SIGNATURE header → response body is the delivery.With the official JS client the whole flow is one wrapped fetch:
import { wrapFetchWithPayment } from "@x402/fetch"; // npm i @x402/fetch @x402/evm
const fetchPaid = wrapFetchWithPayment(fetch, { /* your EVM signer */ });
const res = await fetchPaid("https://ai-money-endpoint.nibiashara.workers.dev/shelf/fx-official?pair=USD-KES");
const data = await res.json();Or install the MCP server (https://ai-money-endpoint.nibiashara.workers.dev/mcp, registry id biz.nibiashara/shelves) and use the job-named tool for this shelf, or buy_shelf as an escape hatch.
Calling this repeatedly? Buy a Shelf Pass once ($0.99 for 110 credits) and send
X-SHELF-PASS: <token> instead of paying per call — this shelf costs 1 credit per call.Example response
{
"pair": "USD-KES",
"rate": 129.2,
"as_of": "2026-08-22",
"source": "frankfurter"
}Delivers
JSON { pair, rate, as_of, source }