AUD/CHF forex exchange rate via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint provides the current AUD/CHF (Australian Dollar to Swiss Franc) foreign exchange rate. It is part of a broader suite of APIs hosted at lowpaymentfee.com, which covers finance, analytics, AI/ML, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint at `/api/v1/forex/AUDCHF/rate` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is made via the `X-PAYMENT` header with no API keys or rate limits required. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.
Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint URL pattern (`/forex/AUDCHF/rate`) and the broader site category ("Finance & Web3 — Market data and financial calculations") strongly suggest it returns a current or recent exchange rate, but the exact response format is unknown.
Capabilities
Use cases
- —Fetching the current AUD/CHF exchange rate for trading bots or portfolio dashboards
- —Programmatic currency conversion calculations involving AUD and CHF
- —Embedding live forex data into financial applications without API key management
- —Agent-driven forex lookups paid per-call via x402 micropayments
Fit
Best for
- —Agents or apps needing on-demand AUD/CHF rates without subscription commitments
- —Developers who want pay-per-call forex data settled in crypto (USDC on Base)
- —Low-volume or bursty forex data consumers who prefer no rate limits or API keys
Not for
- —High-frequency trading requiring sub-millisecond latency or bulk historical data
- —Users who need forex rates for many currency pairs in a single call
- —Anyone without a Base-compatible USDC wallet for x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/AUDCHF/rate \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and confirms pricing, network, and asset details. However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond a wallet-connect prompt. The endpoint's purpose is inferable from its URL but not formally documented.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no content
- —The /forex/AUDCHF/rate path does not appear in the site's listed endpoints; it may be undocumented or dynamically generated
- —No example responses available to verify data quality or freshness
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/forex/AUDCHF/rate
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/AUDCHF/rate
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site categorizes finance endpoints under 'Finance & Web3 — Market data and financial calculations'https://lowpaymentfee.com