Pay-per-call API platform on Base via x402 — 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 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 `/api/v1/wire/18` is listed as "Premium API Access." Its x402 challenge confirms it is live, accepting POST requests and settling in USDC (contract 0x8335…) on Base with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The platform advertises no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 protocol's X-PAYMENT header.
Documentation is extremely sparse: 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 crawl. The exact functionality behind the `/api/v1/wire/18` "Premium API Access" endpoint is unclear — it does not map to any of the named endpoints listed on the homepage. Prospective callers should expect to experiment or contact the provider for details on what this specific route returns.
Capabilities
Use cases
- —Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-request basis
- —Running utility operations like geocoding, validation, and data conversion with instant crypto-settled access
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access settled in USDC on Base
- —Low-volume or bursty workloads where subscription pricing is wasteful
- —x402-compatible clients that can attach payment headers automatically
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production workloads requiring SLAs, rate-limit guarantees, or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/18 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/wire/18 is undocumented. The docs pages are all empty wallet-connect stubs.
Warnings
- —The /api/v1/wire/18 endpoint is not listed among the named APIs on the homepage; its exact functionality is unknown.
- —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.
- —The platform lists many endpoint categories but none have documented input/output contracts.
Citations
- —All endpoints priced at $0.02/request, paid in USDC on Base network with no API keys or rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/wire/18
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/18
- —Documentation pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs