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 catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/181` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. 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 detailed description of what this particular endpoint returns. The platform appears to be a demonstration or early-stage x402 API marketplace. Users should be aware that the actual payload and behavior of this endpoint are undocumented.
Capabilities
Use cases
- —Testing x402 payment protocol integrations
- —Accessing pay-per-request API services without API key management
- —Demonstrating USDC micropayments on Base network
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that need keyless, pay-per-call API access
- —Projects requiring USDC-settled micropayment APIs on Base
Not for
- —Production workloads requiring documented, stable API contracts
- —Users who need detailed request/response schemas before integrating
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/181 \
-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 documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality beyond its label is unknown. Docs pages are empty. This is effectively a stub listing.
Warnings
- —Endpoint functionality is undocumented — 'Premium API Access' is the only description available
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —No OpenAPI schema or request/response examples available
- —Actual behavior and return data of /api/v1/payments/181 are unknown
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/181
- —All endpoints 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 & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base network USDC)https://lowpaymentfee.com/api/v1/payments/181