Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request "Premium API Access" resource at the path /api/v1/emails/14. It is part of a broader platform offering dozens of x402-gated API endpoints spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.
The specific endpoint /api/v1/emails/14 accepts POST requests and returns application/json. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The max amount required is 20,000 base units, which at 6 decimals equals $0.02 USD per call. The x402 challenge was confirmed live, returning a proper 402 with payment parameters.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the /api/v1/emails/14 resource actually returns. The endpoint name suggests email-related data (possibly a specific email record by ID), but this is speculative. Prospective callers should be aware that the lack of documentation makes integration uncertain.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis
- —Agent-driven workflows that need email data without API key provisioning
- —Programmatic access to email records settled via crypto micropayments
Fit
Best for
- —Agents or bots that can settle x402 payments in USDC on Base
- —Use cases requiring keyless, pay-as-you-go API access
- —Low-volume or sporadic email data lookups at $0.02 each
Not for
- —High-volume email operations where per-call pricing is inefficient
- —Users who need detailed API documentation and request/response schemas before integrating
- —Non-crypto workflows that cannot settle USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/14 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no clarity on what /api/v1/emails/14 actually returns. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all render only a wallet-connect prompt
- —No OpenAPI or request/response schema provided; the actual data returned by /api/v1/emails/14 is unknown
- —The purpose of the 'emails/14' resource is unclear — it may be a demo or placeholder endpoint
- —Cannot verify what data is returned without making a paid request
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/emails/14
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/14