Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource at `/api/v1/payments/131` accepts POST requests and charges 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per call (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.
The broader lowpaymentfee.com platform advertises a catalog of pay-per-call endpoints spanning 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 listed endpoints are priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access.
However, the specific functionality behind the `/api/v1/payments/131` endpoint is unclear. The x402 challenge describes it only as "Premium API Access" with a JSON MIME type response, but provides no input/output schema details beyond the HTTP POST method. Documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content. Without further documentation or example responses, the exact data or service returned by this particular endpoint cannot be confirmed.
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing API keys or accounts
- —Agent-driven workflows that pay per call using USDC on Base
- —Integrating pay-as-you-go API calls into Web3 applications
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Applications requiring free or trial-tier access to evaluate the service
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/131 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response, and the specific functionality of /api/v1/payments/131 is undocumented. The docs, pricing, and README pages are effectively empty (wallet-connect only).
Warnings
- —The exact functionality behind /api/v1/payments/131 is not documented — 'Premium API Access' is the only description available.
- —All documentation pages (docs, pricing, README) returned no substantive content.
- —No input or output schema is provided beyond 'application/json' MIME type.
- —The endpoint path '/api/v1/payments/131' does not match any of the catalog endpoints listed on the homepage, making its purpose unclear.
Citations
- —The endpoint charges 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/payments/131
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com