Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.
What it does
This x402-enabled endpoint at `/api/v1/emails/52` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract `0x8335…2913`) with no API keys, no rate limits, and no subscriptions required — just an x402 payment header per request.
The specific endpoint `/api/v1/emails/52` is listed under "Premium API Access" but its exact functionality is not well-documented. Based on the URL path, it likely returns or processes email-related data for a resource identified by ID 52. The x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02 pricing across all endpoints.
Documentation beyond the landing page is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint's precise input parameters and response format remain unknown.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis without needing an API key
- —Integrating email data lookups into agent workflows that support x402 micropayments
- —Accessing premium email information with instant crypto-settled payments on Base
Fit
Best for
- —Agents or applications that already support x402 payment protocol
- —Users who want pay-as-you-go access without subscriptions or API key management
- —Developers building on Base who need low-cost email data endpoints
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume batch email processing where per-request pricing would be costly
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/52 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) with clear pricing ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the exact purpose of the /emails/52 endpoint is unclear. The docs pages are empty beyond a wallet connect prompt.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt
- —No OpenAPI or request/response schema provided; input parameters and response format are unknown
- —The exact functionality of /api/v1/emails/52 is unclear — 'Premium API Access' is a generic label used across the platform
- —The endpoint path suggests a fixed resource ID (52), which may indicate a demo or placeholder rather than a general-purpose API
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/52
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/52