Retrieve email attachments via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides access to email attachments (specifically for email ID 6) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network using the x402 "exact" scheme.
The endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific functionality of this particular endpoint — retrieving attachments for email ID 6 — is not well-documented. The crawled site does not list this endpoint among its advertised APIs, and no OpenAPI schema, request/response examples, or detailed documentation were found. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. As a result, the exact request body format and response structure are unknown.
Capabilities
Use cases
- —Retrieving email attachments programmatically via a single micropayment
- —Agent-driven workflows that need to fetch specific email attachment data without API key provisioning
- —Integrating pay-per-use email data retrieval into automated pipelines
Fit
Best for
- —Agents or scripts that need one-off access to email attachments without subscription overhead
- —Developers experimenting with x402 payment flows on Base
- —Scenarios where no-API-key, instant access is preferred
Not for
- —Bulk email processing or high-volume attachment retrieval (no documented batch support)
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —General-purpose email sending or inbox management
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/6/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint path (emails/6/attachments) is not listed among the site's advertised APIs. The purpose and data returned are unclear, making this effectively a stub listing.
Warnings
- —This specific endpoint (/api/v1/emails/6/attachments) is not listed among the site's advertised APIs — its purpose and data are unclear.
- —No OpenAPI schema, request body format, or response examples are available.
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.
- —The hardcoded email ID '6' in the path suggests this may be a demo or test endpoint rather than a general-purpose API.
Citations
- —The endpoint returns a 402 x402 challenge with USDC on Base, maxAmountRequired 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/emails/6/attachments
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/6/attachments