Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint probed (/api/v1/wire/100) is listed as "Premium API Access" and charges 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 — payment is handled entirely via the x402 protocol's X-PAYMENT header.
The site lists four endpoint 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 uniformly priced at $0.02 per request.
Documentation is extremely sparse — 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 description of what each endpoint accepts or returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but without documentation it is unclear what request body format is expected or what the response payload looks like for /api/v1/wire/100 specifically.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC payment
- —Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis
- —Integrating agent-driven workflows that settle payments automatically via x402
Fit
Best for
- —Developers wanting zero-signup, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost micropayment API calls at $0.02 each
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Anyone unable to transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge confirms the endpoint is live and priced at $0.02 USDC on Base, but documentation is effectively nonexistent — every doc page shows only 'Connect wallet'. No OpenAPI schema, no request/response examples, and no description of what /api/v1/wire/100 actually does beyond the label 'Premium API Access'. This is essentially a stub listing.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content
- —No OpenAPI or schema available — request and response formats are unknown
- —The specific endpoint /api/v1/wire/100 is not listed on the homepage catalog; its purpose is unclear
- —No examples or detailed descriptions for any of the advertised endpoints
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/100
- —All 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
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/wire/100