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 24) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02).
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 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. No API keys or rate limits are advertised; access is granted instantly upon payment.
However, this specific endpoint (`/api/v1/emails/24/attachments`) is not listed among the advertised APIs on the landing page, and no documentation exists describing its request body schema, expected input parameters, or response format. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. As a result, the actual functionality and data returned by this endpoint remain unclear — it could be a demo/test endpoint or part of an unlisted email service.
Capabilities
Use cases
- —Programmatically retrieving email attachments behind a paywall
- —Agent-driven access to stored email data with per-request micropayments
- —Integrating email attachment retrieval into automated workflows
Fit
Best for
- —Agents needing on-demand email attachment access without API keys
- —Developers experimenting with x402 micropayment protocols
- —Workflows requiring pay-per-use email data retrieval on Base
Not for
- —Bulk email processing or high-volume attachment downloads (no documented batch support)
- —Users who need detailed API documentation or guaranteed SLAs
- —Accessing emails other than ID 24 (endpoint is hardcoded to a single email)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/24/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint is not listed among the provider's advertised APIs. The crawled docs pages are empty. Functionality is essentially unknown beyond the URL path suggesting email attachments.
Warnings
- —This specific endpoint (/api/v1/emails/24/attachments) is not listed among the provider's advertised APIs on the landing page.
- —No documentation, request schema, or response schema is available — functionality is inferred solely from the URL path.
- —All docs/pricing/README pages returned only 'Connect wallet' with no substantive content.
- —The endpoint appears hardcoded to email ID 24; generalizability to other email IDs is unknown.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base network.https://lowpaymentfee.com/api/v1/emails/24/attachments
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is the Base USDC contract.https://lowpaymentfee.com/api/v1/emails/24/attachments