x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/claims/80` 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. Each call is gated by an x402 payment challenge settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an `X-PAYMENT` header with a valid payment proof.
The specific `/api/v1/claims/80` endpoint is labeled "Premium API Access" in the x402 challenge but lacks further documentation about what data or functionality it returns. The broader site lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, the `/api/v1/claims/80` path does not appear in any of those documented categories, so its exact purpose is unclear.
The endpoint is confirmed live: it returns a well-formed HTTP 402 challenge with x402 version 1, accepting the `exact` payment scheme on Base with USDC (contract `0x8335…2913`). The payment timeout is 300 seconds. Documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so details about request/response schemas, supported parameters, and output format are unavailable.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access on Base
- —Demonstrating x402 protocol payment flows in development or testing
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base L2
- —Low-volume, pay-as-you-go API consumption without subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume batch processing where per-call fees add up quickly
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/claims/80 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation for this specific path (/api/v1/claims/80), no request/response schema, no examples, and the docs pages are all blank. The endpoint's actual functionality is unknown.
Warnings
- —The /api/v1/claims/80 path is not listed among the documented endpoints on the landing page — its purpose is unclear.
- —All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no usable content.
- —No request or response schema is available; callers cannot know what to send or expect back.
- —The 'Premium API Access' label is generic and does not describe actual functionality.
Citations
- —The endpoint returns a 402 challenge with x402 version 1, exact scheme, on Base network, with USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/claims/80
- —maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/claims/80
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Listed API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com