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 22) 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 (`/api/v1/emails/22/attachments`) is not mentioned on the site's landing page among the advertised API categories. Its purpose — retrieving attachments for a specific email — is unclear in context. Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no documentation describing what this endpoint actually returns or what input it expects beyond a POST request.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven access to stored email data without API keys
- —Pay-per-request email attachment download
Fit
Best for
- —Agents needing on-demand email attachment retrieval without subscription
- —Developers experimenting with x402 micropayment protocols
- —Accessing email data without traditional authentication
Not for
- —Bulk email processing or high-volume attachment downloads (no documented batch support)
- —Users needing detailed API documentation or schema guarantees
- —Production systems requiring SLA or uptime guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/22/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, no OpenAPI schema, no request/response examples, and the specific endpoint (/api/v1/emails/22/attachments) is not listed among the site's advertised APIs. The docs, pricing, and README pages are empty. This is effectively a stub listing.
Warnings
- —This specific endpoint (/api/v1/emails/22/attachments) is not listed among the provider's advertised APIs on the landing page — its purpose and data source are unclear.
- —All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content.
- —No OpenAPI schema, request body schema, or response examples are available.
- —The endpoint references a hardcoded email ID (22); it is unclear whether other email IDs are accessible or what data is being served.
Citations
- —The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/emails/22/attachments
- —USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/22/attachments
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list an emails endpointhttps://lowpaymentfee.com