x402-payable API platform on Base offering 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, 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 via the x402 protocol — no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/trades/26` is described as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. It accepts HTTP POST and returns `application/json`. However, this particular path (`/trades/26`) does not appear in the site's publicly listed API catalog, so its exact functionality is unclear — it may be a trade-related data endpoint or a generic premium access route.
Documentation is extremely thin: 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 endpoint is live and responds with a valid x402 challenge, but without documentation it is difficult to know what request body to send or what response to expect.
Capabilities
Use cases
- —Accessing trade-related data via a single paid API call
- —Integrating pay-per-request endpoints into agent workflows without API key management
- —Programmatic access to premium data behind x402 paywall
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents that can settle x402 payments in USDC on Base
- —Prototyping workflows that need low-cost, on-demand API calls
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production use cases where $0.02/request adds up significantly
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/26 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific /trades/26 path is not documented anywhere on the site. All documentation pages render only 'Connect wallet' with no content. No request/response schemas, no examples, and no OpenAPI spec are available. The listing is essentially a stub with confirmed liveness.
Warnings
- —The /api/v1/trades/26 endpoint is not listed in the site's public API catalog — its exact purpose is unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, request schema, or response schema is available — request format must be guessed.
- —No example responses are available to verify what data this endpoint actually returns.
Citations
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.https://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, instant access, on the Base network.https://lowpaymentfee.com
- —The /api/v1/trades/26 endpoint returns a 402 challenge requesting up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/trades/26