Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.
What it does
This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/11`) using the x402 payment protocol. It 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), settled to an on-chain address.
The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required. Payment is handled entirely via the x402 protocol on the Base L2 network using USDC.
However, the specific `/api/v1/emails/11` endpoint is not listed on the site's landing page among the advertised APIs, and no documentation describes what data it returns or what input it expects beyond a POST request with `application/json` response. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. Because of this lack of documentation for the specific endpoint and the platform generally, the exact behavior and response schema remain unclear.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis without needing an API key
- —Agent-driven workflows that need to fetch email records and can pay per call via x402
- —Integrating low-cost email data lookups into automated pipelines on Base
Fit
Best for
- —Developers or agents who want keyless, pay-per-use email data access
- —x402-compatible clients on the Base network
- —Low-volume or bursty usage patterns where subscription pricing is wasteful
Not for
- —High-volume email processing where per-request costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/11 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /emails/11 resource, no request/response schema, and the docs/pricing/API pages are empty beyond a wallet connect prompt. The specific endpoint isn't even listed on the landing page. This is effectively a stub listing.
Warnings
- —The /api/v1/emails/11 endpoint is not listed among the advertised APIs on the landing page — its purpose and response format are unknown.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no actual content.
- —No request body schema or response schema is available for this endpoint.
- —The endpoint's relationship to email data is inferred solely from the URL path; actual functionality is unverified.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/emails/11
- —All APIs are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/11