x402-gated email API endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/emails/7` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs settled in USDC on the Base network. The specific endpoint is listed under "Premium API Access" and accepts POST requests. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base, and the server fulfills the request upon verification. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD.
The broader lowpaymentfee.com platform advertises endpoints across several categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. However, this specific endpoint (`/api/v1/emails/7`) is not listed on the homepage's catalog and its exact functionality is unclear. The path suggests it may relate to email data retrieval or email-related operations, but no documentation, request schema, or response schema is available to confirm what it returns or what input it expects.
The endpoint is confirmed live: the probe received a proper 402 challenge with x402 version 1, specifying the USDC contract on Base (`0x8335...2913`) and a payTo address. No OpenAPI spec, no detailed docs, and no example responses were found. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Retrieving email-related data via a single paid API call
- —Integrating pay-per-request email functionality into agent workflows
- —Accessing premium email content without API keys or subscriptions
Fit
Best for
- —Agents that need on-demand email data with no subscription commitment
- —Developers experimenting with x402 pay-per-request protocols
- —Use cases requiring keyless, instant-access API calls on Base
Not for
- —High-volume email operations where per-call pricing is inefficient
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/7 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the endpoint path (/api/v1/emails/7) does not appear in the site's own catalog. It is impossible to determine what this endpoint actually does beyond its generic 'Premium API Access' label.
Warnings
- —Endpoint /api/v1/emails/7 is not listed in the provider's own homepage catalog of available APIs
- —No documentation, request schema, or response schema available — functionality is unknown
- —All doc/pricing/README pages return only 'Connect wallet' with no substantive content
- —The purpose of this specific endpoint (emails/7) cannot be verified from available materials
Citations
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/7
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/7
- —All listed APIs on the platform are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —The homepage lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories but does not include /api/v1/emails/7https://lowpaymentfee.com