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 83) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network using the x402 "exact" scheme, with a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals).
The provider lowpaymentfee.com hosts a broader suite of pay-per-call 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here — `/api/v1/emails/83/attachments` — is not documented on the provider's landing page among the advertised API categories, making its exact functionality unclear.
The x402 challenge was successfully captured (HTTP 402 with valid payment parameters), confirming the endpoint is live. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven access to gated email content without API key management
- —Pay-per-use document retrieval from email storage
Fit
Best for
- —Agents needing one-off access to specific email attachments
- —Workflows requiring keyless, pay-as-you-go email data retrieval
- —Developers experimenting with x402 payment protocol integrations
Not for
- —Bulk email processing or mailbox-level access
- —Users who need detailed API documentation before integrating
- —Free or subscription-based email access needs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/83/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and payment parameters are clear, but this specific endpoint (/api/v1/emails/83/attachments) is not listed among the provider's advertised APIs. Documentation pages are empty beyond a wallet-connect prompt. No request/response schema, no examples, and no explanation of what 'emails/83/attachments' actually returns.
Warnings
- —This specific endpoint is not listed among the provider's advertised API categories — its purpose and data source are unclear.
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no technical content.
- —No OpenAPI spec, request schema, or response schema available.
- —The endpoint references a hardcoded email ID (83), suggesting it may be a demo or test resource 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/83/attachments
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The provider lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, but does not list an emails endpoint.https://lowpaymentfee.com