x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/claims/40` is listed as "Premium API Access" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is settled on-chain via the x402 "exact" scheme with a 300-second timeout.
The provider's landing page advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are listed at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access.
However, documentation is essentially absent — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality of the `/api/v1/claims/40` endpoint is unclear; it does not map to any of the named endpoints on the landing page. Without documentation or example payloads, it is impossible to confirm what data this endpoint returns or what input it expects beyond a POST request.
Capabilities
Use cases
- —Paying per-call for API access without API keys or subscriptions
- —Programmatic access to gated endpoints using on-chain USDC on Base
- —Agent-driven API consumption with x402 payment flow
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who want bulk pricing or rate-limit guarantees
- —Anyone needing to understand the exact response schema before paying
Quick start
# 1. POST to the endpoint — you'll get a 402 with payment details
curl -X POST https://lowpaymentfee.com/api/v1/claims/40
# 2. Pay the x402 challenge (0.02 USDC on Base) and include
# the X-PAYMENT header with your signed payment proof
curl -X POST https://lowpaymentfee.com/api/v1/claims/40 \
-H "X-PAYMENT: <signed-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation, no OpenAPI schema, no request/response examples, and the endpoint path (/api/v1/claims/40) doesn't match any named service on the landing page. The actual functionality is unknown.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content.
- —The endpoint path /api/v1/claims/40 does not correspond to any of the named APIs listed on the landing page; its actual functionality is unknown.
- —No OpenAPI schema or request/response examples are provided anywhere.
- —No robots.txt or agents.txt found.
Citations
- —The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/claims/40
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com