x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.
What it does
This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/187` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. It is likely one of the platform's generation or utility endpoints.
Payment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC, which with 6 decimals equals $0.02 USD — consistent with the platform's advertised flat pricing of $0.02 per request. No API keys are required; access is granted by attaching an X-PAYMENT header with a valid x402 payment proof. The platform advertises no rate limits and instant access.
The endpoint accepts HTTP POST requests and returns `application/json` responses. Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what response to expect.
Capabilities
Use cases
- —Accessing a pay-per-call API without needing API key registration
- —Making micropayment-gated API calls settled on Base L2 with USDC
- —Programmatic access to premium content or generation services
Fit
Best for
- —Developers wanting zero-signup API access via crypto micropayments
- —Agents that can construct x402 payment proofs on Base
- —Use cases requiring low-cost per-request billing without subscriptions
Not for
- —Users who need detailed API documentation or schemas before integrating
- —Applications requiring fiat payment methods (credit card, invoice)
- —High-volume use cases where per-request pricing may not be economical
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/187 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and consistent pricing, but there is effectively zero documentation: no OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The resource name 'Premium API Access' is generic and uninformative. Functionality cannot be determined from available material.
Warnings
- —No documentation available — all doc/API/pricing/README pages show only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The exact functionality of resource/187 is unknown; 'Premium API Access' is not descriptive
- —Cannot verify what request body the endpoint expects or what it returns
Citations
- —Platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge confirms USDC on Base with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/generate/resource/187
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/generate/resource/187