x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request in USDC.
The specific endpoint `/api/v1/payments/263` is live and returns a standard x402 challenge (HTTP 402) requiring an `X-PAYMENT` header with a payment proof. The payment settles on Base using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds. No API keys or rate limits are advertised; access is purely pay-per-call.
However, the actual functionality behind this specific `/api/v1/payments/263` endpoint is unclear. The listing title is simply "Premium API Access" with no further documentation about what data or service it returns. The docs, pricing, and README pages on the site all render only a "Connect wallet" prompt with no additional content. Without an OpenAPI schema, example responses, or detailed documentation, the precise capabilities of this endpoint remain unknown. The platform's landing page lists many other endpoints (analytics, AI, finance, utilities) but this particular path does not match any of those listed routes.
Capabilities
Use cases
- —Accessing paid API services without traditional API key registration
- —Making micropayment-gated API calls settled in USDC on Base
- —Integrating pay-per-use endpoints into agent workflows via x402 protocol
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —Applications requiring free or subscription-based access models
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/263 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and network details. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example requests or responses, and the actual functionality of this specific endpoint path (/api/v1/payments/263) is not described anywhere in the crawled material. This is effectively a stub listing.
Warnings
- —The actual functionality behind /api/v1/payments/263 is undocumented — it does not match any of the named endpoints listed on the landing page.
- —All documentation pages (docs, pricing, README, api) return only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI schema or example responses are available.
- —The endpoint path suggests a generic or dynamically generated payment resource rather than a specific API service.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/payments/263
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/263
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com