Pay-per-call EUR/AUD forex rate via x402 on Base, settled in USDC.
What it does
This endpoint provides EUR/AUD foreign exchange rate data, accessible via the x402 payment protocol. It is part of a broader suite of APIs hosted at lowpaymentfee.com covering finance, analytics, AI/ML, crypto, and utility services. Each call costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required.
The endpoint accepts HTTP POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 "exact" scheme. The USDC asset contract on Base (0x8335…2913) is used for settlement, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the payment timeout is 300 seconds.
Documentation on the site is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled content. The exact structure of the forex response (e.g., whether it returns a spot rate, bid/ask spread, timestamp, etc.) is unknown and must be discovered by calling the endpoint.
Capabilities
Use cases
- —Fetching real-time or recent EUR/AUD exchange rates for trading bots or dashboards
- —Integrating forex data into agent workflows that can pay per call via x402
- —Building currency conversion features without managing API key subscriptions
Fit
Best for
- —Agents or apps that need on-demand EUR/AUD rates without subscription overhead
- —x402-native workflows settling micropayments in USDC on Base
- —Developers who want zero-signup access to forex data
Not for
- —High-frequency trading requiring sub-millisecond latency and guaranteed SLAs
- —Users who need comprehensive multi-pair forex coverage from a single documented API
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/EURAUD \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual data returned is entirely unknown, making this effectively a stub listing.
Warnings
- —No OpenAPI spec or schema available — request and response formats are unknown
- —Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no content
- —The exact nature of the forex data (spot rate, bid/ask, historical, etc.) cannot be confirmed from available material
- —No rate limit or SLA information provided
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/forex/EURAUD
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/EURAUD