Pay-per-call EUR/USD forex rate via x402 on Base, settled in USDC at $0.02/request.
What it does
This endpoint provides EUR/USD foreign exchange rate data accessible via the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform offering a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform follow the same pricing model: $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/forex/EURUSD` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network. The payment scheme is "exact," meaning the full amount is charged per request.
Documentation on the site is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint is confirmed live via the 402 challenge, but the actual data format and fields returned are unknown from the available material.
Capabilities
Use cases
- —Fetching the current EUR/USD exchange rate for trading bots or financial dashboards
- —Programmatic access to forex data without API key registration
- —Agent-driven currency conversion workflows that can pay per call via x402
Fit
Best for
- —Agents or apps needing on-demand EUR/USD rates without subscription commitments
- —Developers wanting keyless, pay-per-use forex data on Base/USDC
- —Automated trading or analytics pipelines that settle micropayments in crypto
Not for
- —High-frequency trading requiring sub-millisecond latency and guaranteed SLAs
- —Users who need historical forex time-series data (no evidence this endpoint provides it)
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/EURUSD \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response schema, and no example payloads. The docs pages are empty. This is effectively a stub listing with only the payment challenge and landing page to go on.
Warnings
- —No OpenAPI or schema documentation available — response format is entirely unknown
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content
- —No example request or response payloads could be found
- —The broader platform lists many diverse endpoints (AI, analytics, crypto, utils) all at $0.02 — quality and reliability of underlying data sources is unverified
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC (0.02 USD) on Base networkhttps://lowpaymentfee.com/api/v1/forex/EURUSD
- —Platform 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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/EURUSD