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/80` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
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/80` endpoint is not documented beyond the generic "Premium API Access" label, so its exact behavior is unclear.
Payment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The endpoint is live and returns a proper 402 challenge. Documentation pages (docs, pricing, README) all render only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas are unavailable.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access settled on Base
- —Testing x402 protocol integrations with a low-cost live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that need frictionless pay-per-use API access without credentials
- —Low-volume callers who want no subscription or minimum commitment
Not for
- —Users who need detailed API documentation or well-defined schemas before integrating
- —High-volume production workloads where per-call crypto settlement overhead matters
- —Callers without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/80 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but the actual functionality behind '/api/v1/wire/80' is undocumented. All documentation pages render only 'Connect wallet' with no content. No request/response schema, no examples, and no description of what the endpoint actually does beyond the generic 'Premium API Access' label.
Warnings
- —The specific functionality of /api/v1/wire/80 is not documented — 'Premium API Access' is the only description available.
- —All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no substantive content.
- —No request body schema or response schema is available, so callers cannot know what to send or what to expect back.
- —The platform lists many API categories (AI, finance, data, etc.) but it is unclear which, if any, this specific endpoint maps to.
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/80
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wire/80
- —Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com