Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.
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/38` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requiring up to 20,000 base units of USDC (i.e., $0.02) per call, settled to a Base address. No API keys, rate limits, or subscriptions are needed — each request is paid individually via the X-PAYMENT header.
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 functionality behind `/api/v1/wire/38` is not documented beyond the label "Premium API Access." There is no OpenAPI spec, no request/response schema, and the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. Without documentation or example payloads, the actual behavior of this endpoint is unknown.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing API key registration
- —Agent-driven workflows that settle per-request costs in USDC on Base
- —Testing x402 protocol integrations against a live endpoint
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents with x402 payment capability on Base
- —Prototyping x402 payment flows
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without USDC on the Base network
- —High-volume use cases where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/38 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and network, but there is zero documentation for this specific endpoint — no OpenAPI spec, no request/response schema, no examples. The docs pages render only a wallet-connect prompt. The actual functionality behind '/api/v1/wire/38' is completely opaque.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The label 'Premium API Access' does not describe what the endpoint actually does
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content
- —Request and response formats are entirely unknown
Citations
- —The endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base ($0.02)https://lowpaymentfee.com/api/v1/wire/38
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, instant access, and Base network settlementhttps://lowpaymentfee.com