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/90` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — 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 the `/api/v1/wire/90` endpoint is not documented beyond the label "Premium API Access," so its exact behavior is unclear.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is difficult to know what to send in the POST body or what the response will contain.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint paid per-call with USDC on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Testing x402 payment protocol integrations
Fit
Best for
- —Developers who want zero-signup, pay-as-you-go API access
- —AI agents with Base USDC wallets needing on-demand endpoints
- —x402 protocol experimentation and integration testing
Not for
- —Users who need detailed API documentation before committing
- —High-volume consumers who want bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/90 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. No OpenAPI schema, no examples, and all doc pages are blank beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —The specific functionality of /api/v1/wire/90 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content.
- —No OpenAPI schema, request format, or response examples are available.
- —The broader platform lists many API categories (AI, finance, data, etc.) but none are documented with schemas or examples.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wire/90
- —All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wire/90