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 93) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply include an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises a wide range of x402-gated API categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing model with no minimums or commitments.
This specific endpoint (`/api/v1/emails/93/attachments`) appears to serve attachment data for a particular email resource. The exact response schema and attachment format are not documented in the available crawl material. The site's documentation, pricing, and API pages returned only a "Connect wallet" prompt with no further technical detail, so the precise request body format and response structure remain unclear.
Capabilities
Use cases
- —Programmatically retrieving email attachments behind a paywall
- —Agent-driven workflows that need to fetch specific email attachment data
- —Demonstrating x402 micropayment integration for content access
Fit
Best for
- —AI agents that need to pay-per-call for email attachment retrieval
- —Developers experimenting with x402 protocol on Base
- —Workflows requiring no-signup, keyless API access to email data
Not for
- —Bulk email processing or mailbox management
- —Users who need detailed API documentation before integrating
- —Applications requiring free or subscription-based email access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/93/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request body format, response schema, or what the email/attachment data actually contains. The docs, pricing, and API pages all returned only 'Connect wallet' with no technical content. This is effectively a stub listing.
Warnings
- —No request body schema or response schema documented
- —Documentation pages return only 'Connect wallet' with no technical detail
- —The endpoint path references a specific email ID (93) — unclear if this is a demo or production resource
- —No OpenAPI spec or AI plugin manifest available
- —Exact nature of the 'email attachments' data is unknown
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/emails/93/attachments
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/93/attachments