Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, 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, settled in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.
The specific endpoint `/api/v1/payments/288` 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, with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json.
However, the actual functionality behind this particular endpoint path (`/payments/288`) is unclear — the site's landing page lists many specific API paths (analytics, AI, finance, utils) but does not explicitly describe a `/payments/288` route. Documentation pages (docs, api, pricing, README) all returned only a "Connect wallet" prompt with no substantive content. Without further documentation or example responses, the precise data or service returned by this endpoint cannot be confirmed.
Capabilities
Use cases
- —Agents that need on-demand API access without API key registration
- —Programmatic pay-per-call access to various utility or data endpoints
- —Demonstrating x402 payment protocol integration for micropayments
Fit
Best for
- —Developers exploring x402 protocol-based API monetization
- —AI agents needing keyless, pay-as-you-go API access
- —Low-volume consumers who want no subscription commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/288 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific purpose of /api/v1/payments/288 is not explained anywhere in the crawled material. The docs/pricing/README pages are all blank beyond a wallet connect prompt.
Warnings
- —The specific endpoint path /api/v1/payments/288 is not listed among the site's documented API routes — its actual functionality is unknown.
- —All documentation pages (docs, api, pricing, README) returned no substantive content, only a 'Connect wallet' prompt.
- —No OpenAPI spec, request schema, or response examples are available.
- —The site lists many API categories but provides no detail on what data or models back them — actual service quality is unverifiable.
Citations
- —The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all priced at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per 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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/payments/288