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/189` 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 advertised. The endpoint accepts POST requests and returns application/json.
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 spec, no request/response schema documentation, and no examples of what the "Premium API Access" endpoint actually returns. Without knowing what data or functionality this specific endpoint provides, agents should treat it as an opaque paid endpoint until more documentation surfaces.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without API key management
- —Agent-driven pay-per-call workflows settled in USDC on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-use API access
- —x402 protocol integration testing
- —Scenarios where avoiding API key provisioning is valuable
Not for
- —Users who need detailed documentation or guaranteed SLAs before calling
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone needing to understand the exact response schema before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/189 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint (/api/v1/wire/189 'Premium API Access') is entirely unclear. The docs pages are empty beyond a wallet connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing what this endpoint accepts or returns
- —The purpose of /api/v1/wire/189 ('Premium API Access') is not explained anywhere — it does not match any of the listed catalog endpoints
- —Cannot verify what data or service is actually delivered after payment
Citations
- —All endpoints priced at $0.02/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/189
- —Endpoint described as 'Premium API Access' accepting POST with application/json mime typehttps://lowpaymentfee.com/api/v1/wire/189
- —Catalog includes Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com