Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).
What it does
This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 79) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls outside those listed categories and appears to serve email attachment data. No OpenAPI schema, detailed documentation, or example payloads were found during the crawl; the docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further content.
Because the endpoint path references a hardcoded email ID (79), it is unclear whether this is a general-purpose email attachment retrieval service or a single fixed resource. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to determine the request body format or the structure of the response.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven access to gated email content without API keys
- —Pay-per-request email data retrieval on Base L2
Fit
Best for
- —Agents needing on-demand email attachment access without subscriptions
- —Developers experimenting with x402 micropayment flows
- —Accessing specific email resources with USDC on Base
Not for
- —Bulk email processing or high-volume attachment downloads (no documented batch support)
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —General-purpose email sending or SMTP relay
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/79/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works, but there is no OpenAPI schema, no documentation, no example request/response, and the endpoint path is hardcoded to a single email ID. The crawled docs/pricing/API pages were all empty beyond a wallet-connect prompt.
Warnings
- —No OpenAPI or request/response schema available — request body format is unknown
- —Endpoint path is hardcoded to email ID 79; unclear if other IDs are supported
- —Documentation pages (docs, pricing, API, README) returned no useful content
- —The specific purpose and data returned by this endpoint cannot be verified from available sources
Citations
- —x402 challenge returns 402 with maxAmountRequired 20000 USDC on Basehttps://lowpaymentfee.com/api/v1/emails/79/attachments
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/79/attachments
- —All listed APIs priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com