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 44) 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 (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol using USDC on Base.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific purpose of the /emails/44/attachments endpoint is unclear — it may be a demo or placeholder resource. The x402 challenge is live and well-formed, confirming the endpoint is operational.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Demonstrating x402 payment protocol integration
- —Agent-driven document retrieval behind a paywall
Fit
Best for
- —Developers experimenting with x402 micropayment protocol
- —Agents that need to fetch email attachments without API key management
- —Low-cost per-request data access on Base network
Not for
- —Production email systems requiring documented schemas and SLAs
- —Bulk email processing where per-request fees add up
- —Users needing detailed API documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/44/attachments \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no OpenAPI spec, no request/response documentation, no examples, and the docs pages are empty. The specific purpose of the /emails/44/attachments resource is unclear and may be a demo endpoint. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema provided for request or response bodies
- —The endpoint path /api/v1/emails/44/attachments references a hardcoded email ID (44), suggesting this may be a demo or placeholder
- —The broader platform lists many API categories but none appear to have documented schemas
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/44/attachments
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs