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/78/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 78) 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 commitments 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 using the same x402 payment scheme on Base. However, this specific endpoint is narrowly scoped to retrieving attachments for a single email resource (email 78). Documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the exact request body schema, response format, and what "email 78" represents are unknown.

The endpoint is live: the probe received a well-formed 402 challenge with x402 version 1, confirming the payment flow is operational. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base mainnet USDC).

Capabilities

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

Use cases

  • —Retrieving email attachments programmatically with per-request micropayments
  • —Agent-driven workflows that need to fetch specific email attachment data without API key provisioning
  • —Demonstrating x402 payment protocol integration on Base network

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing keyless, pay-per-use access to email attachment data
  • —Low-volume, on-demand attachment retrieval without subscription overhead

Not for

  • —Bulk email processing or high-volume attachment downloads (no batch endpoint documented)
  • —Users who need comprehensive email management (only a single email resource is exposed)
  • —Anyone requiring detailed API documentation or guaranteed SLAs (docs are effectively empty)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/78/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/78/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 essentially nonexistent — all doc/pricing/API pages just show 'Connect wallet'. The endpoint path targets a hardcoded email ID (78) with no explanation of what it contains, no request/response schema, and no examples. This is effectively a stub listing.

Warnings

  • —Documentation pages (/docs, /api, /pricing, /README) are all empty beyond 'Connect wallet'
  • —The endpoint targets a specific hardcoded email ID (78) — unclear what data this represents or whether it is a demo/placeholder
  • —No request body schema or response schema documented
  • —No OpenAPI spec or AI plugin manifest available
  • —The nature of the 'email attachments' data is completely opaque — could be test/demo data

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:21:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Mqfq7c
Retrieve email attachments via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart