x402basequality 0.25

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/98/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 98) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network using the x402 "exact" scheme, with a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals).

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 utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing covers only the `/api/v1/emails/98/attachments` endpoint, whose exact response schema and attachment content are not documented in the available crawl material.

Because the endpoint path is hardcoded to a specific email ID (98), it is unclear whether this is a general-purpose email attachment retrieval service or a single static resource. No OpenAPI spec, request/response examples, or detailed documentation were found. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentusdc-baseemail-attachmentspay-per-requestjson-response

Use cases

  • —Retrieving attachments from a specific email record via programmatic API call
  • —Agent-driven document retrieval behind a crypto micropayment wall
  • —Demonstrating x402 payment protocol integration for email data access

Fit

Best for

  • —Agents needing to fetch email attachments without API key registration
  • —Developers experimenting with x402 micropayment protocol on Base
  • —One-off attachment retrieval at very low cost ($0.02)

Not for

  • —Bulk email processing or mailbox management
  • —General-purpose email sending or SMTP relay
  • —Users who need detailed API documentation before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/98/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/98/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint path is hardcoded to a single email ID with no explanation of what it returns. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — request body and response format are unknown.
  • —Endpoint path is hardcoded to email ID 98; unclear if this generalizes to other email IDs.
  • —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.
  • —The email attachments endpoint is not listed on the provider's own homepage among their advertised APIs.
  • —Response content and attachment format are completely undocumented.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:23:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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