x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The specific resource `/api/v1/claims/51` is one of many endpoints offered by the platform, 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 (USD Coin) on Base.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the x402 exact scheme: the caller includes an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) to the specified payTo address. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.
However, the specific functionality of `/api/v1/claims/51` is not documented. The platform's landing page lists various endpoint categories (metrics, reports, sentiment analysis, summarization, geocoding, etc.), but `/api/v1/claims/51` does not appear among them. There is no OpenAPI spec, no detailed documentation (the /docs, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content), and no request/response schema beyond the x402 challenge's outputSchema indicating it accepts HTTP POST. The actual data returned by this endpoint is unknown.
Capabilities
Use cases
- —Programmatic access to a premium data or service endpoint with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Demonstrating x402 protocol integration for micropayment-gated services
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that can sign USDC payments and need frictionless API access
- —Use cases where avoiding API key management and subscriptions is valuable
Not for
- —Users who need well-documented, schema-defined API contracts before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/claims/51 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/claims/51 is completely undocumented — it doesn't appear in the site's own endpoint listing, there is no OpenAPI spec, no request/response schema, and all documentation pages returned only a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The endpoint /api/v1/claims/51 is not listed among the platform's documented APIs — its purpose and response format are unknown.
- —No OpenAPI specification or request/response schema is available.
- —All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content.
- —The actual data or service provided by this specific endpoint cannot be verified.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/claims/51
- —All platform 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 endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/claims/51