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/45` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform offers endpoints across four categories: 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 `/api/v1/wire/45` endpoint does not appear in the site's public API listing, and no documentation describes what it actually returns. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. Without an OpenAPI schema, request/response examples, or any description of the wire/45 endpoint's functionality, it is unclear what data or service this particular endpoint provides.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing API keys or subscriptions
- —Agent-driven workflows that settle per-request costs in USDC on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents with x402 payment capability on Base
- —Prototyping x402 integrations at low cost ($0.02/call)
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/45 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/v1/wire/45 actually does. No OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint path doesn't match any listed API on the site. This is effectively a stub listing.
Warnings
- —The endpoint /api/v1/wire/45 does not appear in the site's public API catalog — its purpose is unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI schema or request/response examples are available for this endpoint.
- —The actual functionality behind 'Premium API Access' is undocumented and cannot be verified.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/wire/45
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/wire/45
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no further content.https://lowpaymentfee.com/docs