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/123` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 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 uniformly priced at $0.02 per request.
However, the specific functionality of the `/api/v1/wire/123` endpoint is unclear. The description simply says "Premium API Access" with no further documentation about what data or service it returns. The docs, pricing, and API pages all resolve to a minimal "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or usage examples. Callers should be aware that the actual response payload and input parameters for this endpoint are undocumented.
Capabilities
Use cases
- —Accessing premium API services with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to data or services without subscription commitments
Fit
Best for
- —Developers wanting zero-commitment pay-per-call API access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto micropayments over traditional API key subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —High-volume use cases where per-request pricing may add up compared to bulk plans
- —Anyone without a Base network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/123 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /api/v1/wire/123 endpoint is entirely undocumented. The docs pages all render only a 'Connect wallet' prompt with no technical content.
Warnings
- —The specific functionality of /api/v1/wire/123 is completely undocumented — 'Premium API Access' is the only description available.
- —No OpenAPI schema, request parameters, or response format documentation exists.
- —All documentation pages (docs, pricing, API, README) resolve to a minimal 'Connect wallet' page with no useful content.
- —The endpoint path '/api/v1/wire/123' suggests a specific resource ID but its meaning is unknown.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wire/123
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/123