x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/claims/22` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific functionality behind `/api/v1/claims/22` is labeled "Premium API Access" but its exact purpose is not documented beyond that generic title — it is not listed among the named endpoints on the site's landing page, so it may be a catch-all or test route.
All endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network via the x402 exact-payment scheme. The probe confirms the endpoint is live, returning a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913, 6 decimals = $0.02). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The POST method is required.
Documentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples. Without knowing what this specific endpoint returns, agents should treat it as an opaque JSON endpoint and experiment cautiously.
Capabilities
Use cases
- —Accessing a pay-per-request JSON API without needing API keys or subscriptions
- —Testing x402 payment flows on the Base network at low cost
- —Programmatic access to an unnamed premium data or utility service
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need keyless, pay-as-you-go API access on Base
- —Low-cost per-request API consumption without rate limits
Not for
- —Users who need well-documented, schema-defined endpoints
- —Production workloads requiring SLA guarantees or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/claims/22 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/claims/22 is undocumented. There is no OpenAPI spec, no request/response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The listing is effectively a stub.
Warnings
- —The exact functionality of /api/v1/claims/22 is unknown — it is not listed among the named endpoints on the landing page.
- —No documentation, OpenAPI spec, or request/response schema is available.
- —All doc/pricing/README pages render only 'Connect wallet' with no content.
- —No examples of expected input or output exist in any crawled material.
Citations
- —Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/claims/22
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/claims/22
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com