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 attachment data (specifically email ID 47) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply include an X-PAYMENT header with a valid x402 payment proof.
The hosting site lowpaymentfee.com offers a broad catalog of x402-gated endpoints spanning data analytics, AI/ML inference, finance, and utility services, all priced at $0.02 per request. However, this specific endpoint (/api/v1/emails/47/attachments) is not listed on the site's public landing page among the advertised APIs. Its purpose — retrieving attachments for a specific email — is unclear from available documentation. The docs, pricing, and API pages on the site are essentially empty (showing only a "Connect wallet" prompt), so there is no further documentation on request/response schemas or what data this endpoint actually returns.
The endpoint is confirmed live: the probe received a proper HTTP 402 challenge with x402 version 1, advertising the exact payment scheme (USDC on Base, payTo address 0x1A2B…85F3, 300-second timeout). The output schema indicates it is discoverable and accepts HTTP POST.
Capabilities
Use cases
- —Programmatically retrieving email attachments behind a paywall
- —Agent-driven workflows that need to fetch specific email attachment data
- —Demonstrating x402 micropayment integration for data access
Fit
Best for
- —Agents or scripts that need on-demand email attachment retrieval without API key management
- —Developers experimenting with x402 payment protocol on Base
- —Low-volume, pay-per-use access to email data
Not for
- —Bulk email processing or high-volume attachment downloads (no documented batch support)
- —Users who need comprehensive email management (this is a single-resource endpoint for email 47)
- —Anyone requiring detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/47/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but it is not listed among the site's advertised APIs, has no documentation on request/response schemas, and the docs/pricing/API pages are empty stubs. The purpose of this specific email-attachment endpoint is unclear and may be a test or internal resource.
Warnings
- —This endpoint (/api/v1/emails/47/attachments) is not listed on the provider's public landing page among advertised APIs — it may be a test, internal, or deprecated resource.
- —No request or response schema documentation is available; the docs, pricing, and API pages return only a 'Connect wallet' prompt with no content.
- —The endpoint targets a hardcoded email ID (47), suggesting it may not be a general-purpose email attachment API.
Citations
- —The endpoint returns a valid x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02), and 300-second timeout.https://lowpaymentfee.com/api/v1/emails/47/attachments
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The docs, pricing, API, and README pages show only a 'Connect wallet' prompt with no substantive content.https://lowpaymentfee.com/docs