x402-gated email data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/35`) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 "exact" scheme to the specified wallet address, with no API keys or rate limits required.
The broader lowpaymentfee.com platform advertises a range of pay-per-request API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per call. However, the specific `/api/v1/emails/35` endpoint is not listed on the site's landing page among the advertised APIs, and no documentation describes what data or functionality it returns. The endpoint accepts POST requests and returns `application/json`. Beyond that, the request body schema, response schema, and the meaning of the path parameter `35` are undocumented.
Because the crawled docs pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a "Connect wallet" prompt with no substantive content, there is essentially no documentation available for this or any other endpoint on the platform. Users should treat this as an exploratory, minimally-documented service.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis
- —Agent-driven data access without API key provisioning
- —Programmatic access to premium content gated by x402 micropayments
Fit
Best for
- —Agents or scripts that can handle x402 payment flows
- —Users who want keyless, pay-as-you-go API access
- —Developers experimenting with x402 protocol integrations
Not for
- —Users who need documented request/response schemas before integrating
- —High-volume use cases where per-request pricing may add up
- —Anyone needing guaranteed SLAs or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/35 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint does, what request body it expects, or what it returns. The /emails/35 path is not listed among the site's advertised APIs. Docs pages are empty. This is effectively a stub listing.
Warnings
- —The /api/v1/emails/35 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.
- —All documentation pages (/docs, /api, /pricing, /README) returned no content beyond a 'Connect wallet' prompt.
- —No request or response schema is available; the meaning of the path parameter '35' is unknown.
- —The broader platform lists many API categories but none appear to have public documentation.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/emails/35
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive content.https://lowpaymentfee.com/docs