Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.
The specific endpoint at `/api/v1/transfers/17` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises four categories of APIs: 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). However, documentation beyond the landing page is essentially empty — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.
Capabilities
Use cases
- —Calling AI inference endpoints (sentiment, summarization, classification, embeddings) on a pay-per-use basis without API key management
- —Fetching real-time crypto price feeds, exchange rates, and gas estimates via micropayments
- —Running data analytics queries and exporting data with per-request USDC payments
- —Using utility services like geocoding, validation, and conversion without subscriptions
Fit
Best for
- —Agents or developers who want instant API access without signup or API keys
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
- —x402-compatible clients that can settle USDC payments on Base network
Not for
- —High-volume production workloads where per-request costs would accumulate significantly
- —Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating
- —Callers who cannot settle crypto payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/17 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific endpoint '/api/v1/transfers/17' has a generic 'Premium API Access' description with no indication of what it actually does. This is effectively a stub listing.
Warnings
- —No OpenAPI specification or request/response schema available
- —Documentation pages (docs, pricing, README, api) are empty — only show 'Connect wallet'
- —The endpoint path '/api/v1/transfers/17' does not match any of the advertised API categories; its actual function is unknown
- —No examples of request bodies or response payloads are available from any source
- —Cannot verify that the advertised AI, finance, or utility endpoints actually function as described
Citations
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/transfers/17
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no further contenthttps://lowpaymentfee.com/docs