Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/185` is listed as "Premium API Access" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific endpoint probed here (`/api/v1/wire/185`) does not clearly map to any of those named categories — it may be a generic or internal wire endpoint.
Documentation is extremely thin. The /docs, /pricing, /api, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality `/api/v1/wire/185` actually returns. The endpoint is live and responds with a well-formed x402 challenge, but without documentation it is unclear what payload to send or what response to expect.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without traditional API key registration
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Exploring x402 protocol integration for micropayment-gated services
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base L2
- —Use cases needing keyless, pay-as-you-go API access
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need fiat payment options or traditional billing
- —Anyone needing detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/185 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint does, what inputs it expects, or what it returns. No OpenAPI schema, no examples, and the docs pages are empty. The endpoint path '/api/v1/wire/185' does not correspond to any named service on the landing page.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content
- —The endpoint path /api/v1/wire/185 does not match any of the named API endpoints listed on the homepage
- —No OpenAPI or output schema provided — request format and response structure are unknown
- —Purpose of 'Premium API Access' is entirely unspecified
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wire/185
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wire/185
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com