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 marketplace that exposes a broad set of 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/wire/198` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is made via the `exact` scheme to the specified payTo address. The endpoint accepts HTTP POST and returns `application/json`.
Documentation is extremely sparse — the /docs, /pricing, /api, 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 usage examples available from the crawled material. The purpose of the `/api/v1/wire/198` endpoint specifically is unclear; it may be a generic premium access route or a specific resource. Without documentation, callers will need to experiment to discover the expected request body and response format.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys
- —Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments
- —Running geocoding, validation, or data conversion tasks with no subscription commitment
- —Exporting data or generating analytics reports with per-request billing
Fit
Best for
- —Agents or developers who want zero-signup, pay-as-you-go API access
- —Low-volume or bursty workloads where subscription pricing is wasteful
- —x402-compatible agents that can settle USDC on Base automatically
Not for
- —High-volume production workloads needing SLAs, rate-limit guarantees, or dedicated support
- —Users without a Base-compatible USDC wallet or x402 client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/198 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works and costs $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/wire/198 is undocumented. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown
- —All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content
- —The specific purpose of /api/v1/wire/198 ('Premium API Access') is not explained anywhere in the crawled material
- —No examples, error codes, or rate limit information documented
Citations
- —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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/wire/198
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com