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/37` 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 (USD Coin) at a cost of $0.02 per request. The x402 protocol means no API keys or accounts are needed — callers attach a payment header and receive the response immediately.
The specific endpoint `/api/v1/emails/37` is listed under "Premium API Access" but the crawled site does not enumerate an explicit emails category or document what this particular endpoint returns. It appears to be one of many endpoints on the platform, all sharing the same $0.02 pricing and x402 payment flow. The platform advertises no rate limits, no minimums, and instant access.
The x402 challenge confirms the endpoint is live, accepting POST requests, and requiring a maximum of 20,000 base units of USDC (6 decimals → $0.02) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found during the crawl — the docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis without needing an API key
- —Integrating low-cost email data lookups into agent workflows that support x402
- —Programmatic access to email resources settled instantly on Base L2
Fit
Best for
- —Agents or bots that can settle x402 payments in USDC on Base
- —Developers wanting zero-signup, pay-as-you-go email data access
- —Low-volume or sporadic usage where per-call pricing is preferable to subscriptions
Not for
- —High-volume email operations where per-call costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone unable to transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/37 \
-H "X-PAYMENT: <x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no example request/response, and the specific purpose of the /emails/37 endpoint is undocumented. The crawled docs/pricing/README pages were empty beyond a wallet-connect prompt.
Warnings
- —The specific functionality of /api/v1/emails/37 is not documented anywhere in the crawled material — 'Premium API Access' is a generic label.
- —No OpenAPI spec, request schema, or response schema is available.
- —All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content.
- —The emails endpoint is not listed among the categories shown on the homepage (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), raising questions about its status.
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge confirms the endpoint is live, accepting POST, requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.https://lowpaymentfee.com/api/v1/emails/37
- —Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.https://lowpaymentfee.com/api/v1/emails/37