Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/policies/97` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform offers endpoints across four categories: 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.
This particular endpoint (`/api/v1/policies/97`) is labeled "Premium API Access" but no further documentation describes what data or functionality it returns. The docs, pricing, and API pages behind the site require a wallet connection and yielded no additional content during crawl. Without schema details or example responses, the actual payload of this endpoint remains unknown.
Capabilities
Use cases
- —Accessing premium API data without signing up for an API key
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven workflows that need instant, keyless API access
Fit
Best for
- —Developers wanting frictionless pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto 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 subscription discounts
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/97 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no documentation beyond the landing page, no example request/response, and the actual functionality behind 'Premium API Access' at /api/v1/policies/97 is completely undocumented. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages all require wallet connection and returned no content.
- —The specific functionality of /api/v1/policies/97 ('Premium API Access') is not described anywhere in the crawled material.
- —No OpenAPI spec, no request/response schema, and no example payloads are available.
- —The platform appears to be a generic demo or template site; the breadth of claimed endpoints (AI, finance, geocoding, etc.) at uniform $0.02 pricing is unverified.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/policies/97
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/policies/97
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com