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 email ID 52) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json responses.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access via the x402 protocol.
However, the specific endpoint being listed here — `/api/v1/emails/52/attachments` — is not documented on the site's landing page among the advertised API categories. Its purpose (retrieving attachments for a specific email with ID 52) is unclear and may be a demo or internal resource. No request/response schema documentation was found beyond the x402 challenge metadata. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven access to gated email content
- —Demonstrating x402 payment flows for email data
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents needing programmatic access to specific email attachments
- —Low-cost per-request email data retrieval without API keys
Not for
- —Bulk email processing or mailbox management
- —Users needing documented request/response schemas before integrating
- —Production email workflows requiring reliability guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/52/attachments \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (returns 402 with a valid x402 challenge), but there is no documentation for this specific email attachments endpoint, no request/response schema, and the docs pages are empty. The endpoint path references a hardcoded email ID (52), which raises questions about its general utility. Effectively a stub listing.
Warnings
- —The endpoint /api/v1/emails/52/attachments is not listed among the advertised APIs on the landing page — its purpose and general availability are unclear.
- —No request body schema or response schema documentation is available.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.
- —The hardcoded email ID '52' in the path suggests this may be a demo or single-resource endpoint rather than a general-purpose API.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/emails/52/attachments
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not include an emails endpoint.https://lowpaymentfee.com