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. 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 endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/165` is labeled "Premium API Access" but the crawled material does not clarify what distinguishes it from the other listed endpoints or what data/functionality it returns. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network. The response MIME type is `application/json`.
Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. Agents should be aware that the actual functionality behind this endpoint is unclear from available materials.
Capabilities
Use cases
- —Accessing a premium API endpoint with per-call USDC micropayments on Base
- —Demonstrating x402 payment protocol integration for agent-to-API commerce
- —Testing pay-per-request API patterns without API key registration
Fit
Best for
- —Developers exploring x402 protocol payment flows
- —Agents needing keyless, pay-per-call API access on Base
- —Prototyping micropayment-gated API services
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Production workloads requiring well-documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/165
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with a valid USDC payment proof on Base to access.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint is entirely unclear. The site's docs pages are empty beyond a wallet connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/payments/165 ('Premium API Access') is not described anywhere in the crawled material.
- —No OpenAPI schema or request/response examples are provided.
- —This endpoint path (/api/v1/payments/165) does not appear in the site's own listed API catalog, raising questions about its purpose.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/165
- —All endpoints on the platform 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 & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/165