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/76` 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) 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 lowpaymentfee.com site 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 listed endpoints are priced at $0.02 per request. However, the specific endpoint `/api/v1/wire/76` does not clearly map to any of these named services — its description is simply "Premium API Access" with no further documentation on what data or functionality it returns.
Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/wire/76` endpoint actually does beyond its generic title. Callers should be aware that the actual behavior of this endpoint is undocumented.
Capabilities
Use cases
- —Accessing a pay-per-call API without needing API keys or subscriptions
- —Making micropayment-gated API requests settled in USDC on Base
- —Integrating x402-compatible endpoints into agent workflows
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto-native payment rails over traditional billing
Not for
- —Anyone needing documented request/response schemas before integrating
- —Use cases requiring guaranteed SLAs or support contracts
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/76 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming it accepts $0.02 USDC on Base. However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality ('Premium API Access') is completely undefined. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —The specific endpoint /api/v1/wire/76 has no documentation describing what it does or what it returns.
- —No OpenAPI schema, request format, or response examples are available anywhere on the site.
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content.
- —The endpoint name 'Premium API Access' does not map to any of the named services listed on the homepage.
Citations
- —The endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/wire/76
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/wire/76