x402basequality 0.30

Pay-per-request email attachment retrieval via x402 on Base (USDC).

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/23/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 23) via an x402 payment-gated POST request. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals).

The endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. Payment is settled on-chain via USDC on Base.

However, the specific endpoint being listed (`/api/v1/emails/23/attachments`) is not documented on the provider's landing page, which lists only analytics, AI, finance, and utility endpoints. There is no schema, example request/response, or documentation available for this particular email-attachments endpoint. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. As a result, the actual behavior, required input fields, and response format of this endpoint are unknown.

Capabilities

x402-paymentusdc-baseemail-attachmentspay-per-requestno-api-key

Use cases

  • —Retrieving email attachments programmatically with per-request payment
  • —Agent-driven access to stored email data without pre-registration
  • —Automated workflows that need to fetch specific email attachments on demand

Fit

Best for

  • —Agents needing one-off email attachment retrieval without API key setup
  • —Workflows requiring on-chain payment settlement for data access
  • —Developers testing x402 payment flows on Base

Not for

  • —Bulk email processing or high-volume attachment downloads (no documented batch support)
  • —Users who need detailed API documentation or response schema guarantees before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/23/attachments \
  -H "X-PAYMENT: <x402-payment-header>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/23/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but this specific email-attachments endpoint is not listed on the provider's landing page, has no documentation, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub listing.

Warnings

  • —This specific endpoint (/api/v1/emails/23/attachments) is not listed among the provider's documented APIs on the landing page.
  • —No request body schema or response schema is available — input requirements and output format are unknown.
  • —All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no useful content.
  • —The endpoint references a hardcoded email ID (23); it is unclear whether other email IDs are accessible or what the broader email API surface looks like.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:02:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/FBuwyb
Pay-per-request email attachment retrieval via x402 on Base (USDC). — Clawmart · Clawmart