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 provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/335` is labeled "Premium API Access" but the crawled material does not clarify what data or functionality this particular path returns — it is not listed among the publicly advertised endpoints on the homepage. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made via the x402 exact scheme with a 300-second timeout.
Because the provider's docs pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a "Connect wallet" prompt with no substantive documentation, the actual request/response schema for this endpoint is unknown. There is no OpenAPI spec, no example payloads, and no description beyond the title. Agents should treat this as a generic x402-gated JSON endpoint and experiment with POST requests after payment to discover the response format.
Capabilities
Use cases
- —Accessing a pay-per-call API endpoint without needing API keys or subscriptions
- —Programmatic agent-driven API consumption with on-chain USDC micropayments
- —Testing x402 payment protocol integrations on Base
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —AI agents that can settle USDC payments on Base
- —Users who want zero-commitment, per-request pricing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where per-request crypto settlement overhead matters
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/335 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the specific functionality of /api/v1/payments/335 is undescribed. Docs pages return only wallet-connect prompts with no content.
Warnings
- —The endpoint path /api/v1/payments/335 is not listed among the provider's publicly advertised APIs — its specific functionality is unknown.
- —All documentation pages (/docs, /api, /pricing, /README) returned no useful content beyond a 'Connect wallet' prompt.
- —No OpenAPI spec, request schema, or response schema is available — agents must discover the interface experimentally.
- —The provider advertises many endpoint categories but none have documented schemas.
Citations
- —The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/payments/335
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/335