Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network.
The specific endpoint at `/api/v1/wire/68` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/wire/68` endpoint actually returns. The name "Premium API Access" is generic and does not clarify what data or functionality this specific endpoint provides. Prospective callers should be aware that without documentation, the actual behavior of this endpoint is unknown.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting data with per-request billing
- —Using utility services like geocoding, validation, and conversion via micropayments
Fit
Best for
- —Agents or developers who want zero-commitment, pay-as-you-go API access
- —Use cases requiring no API key signup or subscription
- —Applications already integrated with x402 payment protocol on Base
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans
- —Anyone without USDC on Base or x402 client support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/68 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific endpoint name 'Premium API Access' is entirely generic with no indication of what it actually does. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet' with no content
- —The endpoint name 'Premium API Access' is generic and does not describe what the endpoint returns
- —No request or response schema is documented; callers cannot know what to send or expect back
- —No OpenAPI spec or ai-plugin manifest found
- —It is unclear what /api/v1/wire/68 specifically does versus the other listed endpoints
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/wire/68
- —Endpoint described as 'Premium API Access' accepting POST with application/json mime typehttps://lowpaymentfee.com/api/v1/wire/68
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com