Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/wire/120` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.
The platform advertises 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.
However, documentation is extremely thin. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific functionality of the `/api/v1/wire/120` endpoint (labeled "Premium API Access") is not described anywhere on the site, making it unclear what data or service it actually returns. The endpoint is confirmed live via a valid 402 challenge.
Capabilities
Use cases
- —Programmatic access to API services without account registration or API keys
- —Agent-driven workflows that need on-demand paid API calls settled in crypto
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers wanting zero-signup API access via crypto micropayments
- —AI agents that can autonomously pay for API calls using x402
- —Users already holding USDC on Base who want frictionless API consumption
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Production systems requiring well-documented request/response schemas
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/120 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of the /api/v1/wire/120 endpoint is entirely undescribed. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —The specific functionality of /api/v1/wire/120 ('Premium API Access') is not documented anywhere on the site
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content
- —No OpenAPI spec, request schema, or response schema is available
- —No examples of request bodies or response payloads exist in the crawled material
- —The endpoint name 'wire/120' does not correspond to any of the listed API categories on the homepage
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/120
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/120