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/82` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) 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 (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
However, the specific functionality behind `/api/v1/wire/82` is not documented beyond the label "Premium API Access." The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns. Callers should be aware that the actual behavior of this endpoint is unknown from available documentation.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without requiring API key registration
- —Agent-driven workflows that need to pay for API calls on-the-fly using USDC on Base
- —Exploring x402-protocol-based API monetization
Fit
Best for
- —Developers or agents already holding USDC on Base who want frictionless API access
- —Testing x402 payment flows against a live endpoint
- —Low-volume, on-demand API consumption without subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Anyone who needs to know exactly what the endpoint returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/82 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and no indication of what 'Premium API Access' actually provides. The docs/pricing/API pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The actual functionality of /api/v1/wire/82 ('Premium API Access') is completely undocumented — it is unclear what data or service it returns.
- —No OpenAPI schema, no request body schema, and no response examples are available.
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no useful content.
- —The platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base networkhttps://lowpaymentfee.com/api/v1/wire/82
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com