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/86/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 86) 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 range of API categories including data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform share the same $0.02/request pricing model with no minimums or commitments.

However, the specific endpoint being listed here — `/api/v1/emails/86/attachments` — is not documented on the site's landing page among the advertised APIs. Its exact functionality, request body schema, and response format are not documented in any crawled page. The endpoint is confirmed live via a valid 402 challenge, but the lack of documentation means callers will need to experiment or contact the provider to understand the expected input and output formats.

Capabilities

x402-paymentemail-attachmentsusdc-basemicropaymentpost-endpointjson-response

Use cases

  • —Retrieving attachments from a specific email record via programmatic API call
  • —Agent-driven workflows that need to fetch email attachment data with per-request payment
  • —Demonstrating x402 micropayment integration on the Base network

Fit

Best for

  • —Developers experimenting with x402 payment protocols
  • —Agents that need to pay-per-call for email attachment retrieval
  • —Projects already using USDC on Base network

Not for

  • —Bulk email processing or mailbox management — this targets a single email ID
  • —Users needing well-documented, production-grade email APIs with full schema documentation

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/86/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/86/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, this specific endpoint is not listed among the site's advertised APIs, there is no OpenAPI schema, no request/response examples, and the crawled docs/pricing/API pages all returned only 'Connect wallet' with no useful content. The purpose of accessing 'emails/86/attachments' is opaque.

Warnings

  • —This specific endpoint (/api/v1/emails/86/attachments) is not listed among the provider's advertised APIs on the landing page — its purpose and data source are unclear.
  • —No request body schema or response schema is documented anywhere in the crawled material.
  • —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.
  • —The endpoint references a hardcoded email ID (86), suggesting it may be a demo or test resource rather than a general-purpose API.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:23:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/BL8CjX
Retrieve email attachments via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart