Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/charges/363` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call, with a 300-second payment timeout. The response MIME type is application/json.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular endpoint returns. The site's landing page groups endpoints into categories (analytics, AI, finance, utilities) but this specific charge ID (363) is not directly listed among them, so its exact purpose is unclear beyond the generic "Premium API Access" label.
Capabilities
Use cases
- —Paying per request for API data without needing an API key or subscription
- —Integrating x402 payment-gated endpoints into autonomous agent workflows
- —Accessing premium data or services with USDC micropayments on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional API key subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/363 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The specific functionality of /api/v1/charges/363 is unknown. Docs pages are empty (wallet-connect only). This is effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; exact functionality of this endpoint is unknown.
- —The endpoint path /api/v1/charges/363 does not appear in the site's listed API catalog, so its purpose is unclear.
- —Example request and response bodies cannot be determined from available material.
Citations
- —The endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/363
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02https://lowpaymentfee.com/api/v1/charges/363
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no further contenthttps://lowpaymentfee.com/docs