Pay-per-call API platform on Base (USDC) 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/payments/212` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.
This particular endpoint (`/api/v1/payments/212`) is confirmed live, returning a proper 402 challenge with x402 version 1. However, the crawled documentation pages (docs, pricing, API, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas and detailed behavior of this endpoint remain unknown. The endpoint accepts POST requests and returns `application/json`.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to data, AI, finance, or utility endpoints without subscription commitments
Fit
Best for
- —Developers who want to pay per call without managing API keys or subscriptions
- —AI agents that can settle x402 payments autonomously on Base
- —Low-volume or bursty workloads where flat-rate plans are wasteful
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Anyone without a Base-compatible USDC wallet or x402 client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/212 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The purpose of this specific '/payments/212' endpoint beyond 'Premium API Access' is unclear.
Warnings
- —No documentation available — all doc pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.
- —No request or response schema is provided; the actual functionality of /api/v1/payments/212 is unknown.
- —The endpoint path '/api/v1/payments/212' does not match any of the advertised API categories on the homepage, making its purpose ambiguous.
- —The platform lists many endpoint categories but none have documented schemas or examples.
Citations
- —The endpoint returns a 402 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/payments/212
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/payments/212
- —Documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content.https://lowpaymentfee.com/docs