x402basequality 0.30

Retrieve email attachments via x402 micropayment on Base for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/27/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 27) behind an x402 paywall. The endpoint 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), with no API keys, rate limits, or subscriptions required.

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/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request via the x402 protocol. However, this specific endpoint is narrowly scoped to retrieving attachments for a single email resource (email 27). Documentation beyond the landing page is essentially empty (all subpages just show a "Connect wallet" prompt), so the exact request body schema, response format, and what data the attachments contain are unknown.

The endpoint is confirmed live: it returns a well-formed x402 version 1 challenge with USDC (contract 0x8335…) on Base. The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

Capabilities

x402-paymentemail-attachmentsusdc-basepay-per-requestno-api-key

Use cases

  • —Programmatically retrieving email attachments without authentication or subscriptions
  • —Agent-driven workflows that need to fetch specific email attachment data on demand
  • —Demonstrating x402 micropayment integration for data retrieval

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing one-shot access to email attachment data
  • —Low-friction pay-per-use data access without API key management

Not for

  • —Bulk email processing or mailbox-level access
  • —Users needing detailed API documentation or guaranteed SLA
  • —Accessing arbitrary emails — this endpoint is scoped to email ID 27 only

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/27/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/27/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but documentation is effectively nonexistent — all doc/pricing/API pages show only 'Connect wallet'. The endpoint path is very specific (single email ID 27) with no explanation of what data it serves, no request/response schema, and no examples. This is essentially a stub listing.

Warnings

  • —No documentation available — all subpages render only 'Connect wallet'
  • —Endpoint is scoped to a single hardcoded email ID (27); unclear if this is a demo or production resource
  • —No request body schema or response schema documented
  • —Unknown what 'attachments' data is actually returned
  • —Provider site lists many API categories but none appear documented beyond the landing page

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:03:16Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/cbRJtC
Retrieve email attachments via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart