Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint `/api/v1/payments/258` is listed under the title "Premium API Access" but the crawled site does not describe what this particular route returns — it is not among the named endpoints on the homepage (analytics, AI, finance, utils). It accepts HTTP POST requests and returns `application/json`. Payment is handled via the x402 exact-amount scheme: the caller attaches an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payTo address on Base.
Because the provider's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all render only a "Connect wallet" prompt with no further content, there is no detailed API documentation available for this or any other endpoint. The actual functionality behind `/api/v1/payments/258` is unclear — it may be a generic demo or placeholder. Prospective callers should be aware of this ambiguity.
Capabilities
Use cases
- —Demonstrating x402 payment protocol integration with a low-cost endpoint
- —Testing agent-driven micropayment workflows on Base
- —Accessing a generic premium API resource without API key management
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that need keyless, pay-per-call API access on Base
- —Low-cost micropayment testing against a live endpoint
Not for
- —Users who need well-documented, production-grade APIs with clear schemas
- —Anyone requiring free or subscription-based access without crypto payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/258 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific functionality of /api/v1/payments/258 is undescribed. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.
Warnings
- —The specific endpoint /api/v1/payments/258 is not listed among the named APIs on the homepage — its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no usable content.
- —No request or response schema is available; callers cannot know what to send or expect back.
- —This may be a demo or placeholder endpoint rather than a production service.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/payments/258
- —Endpoint accepts HTTP POST and returns application/json per outputSchemahttps://lowpaymentfee.com/api/v1/payments/258