x402basequality 0.30

Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/75/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 75) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme micropayment of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).

The broader lowpaymentfee.com platform advertises a wide catalog of x402-gated API endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.

The specific endpoint being listed here — `/api/v1/emails/75/attachments` — is not prominently featured on the site's landing page, and no documentation, request schema, or response schema is available beyond the x402 challenge metadata. The endpoint is confirmed live (HTTP 402 challenge returned successfully), but the actual behavior, required POST body, and response format are undocumented. Use with caution until more documentation surfaces.

Capabilities

x402-paymentusdc-baseemail-attachmentsmicropaymentpost-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
  • —Integrating email attachment retrieval into automated pipelines without API key management

Fit

Best for

  • —Agents or scripts that need on-demand email attachment access with no subscription
  • —Developers exploring x402 micropayment patterns on Base
  • —Low-volume, pay-per-use email data retrieval

Not for

  • —Bulk email processing or high-throughput attachment downloads (no documented batch support)
  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —Accessing emails other than ID 75 (this endpoint is scoped to a single email)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/75/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/75/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI schema, no request/response documentation, and the specific email-attachments endpoint is not listed on the site's landing page. The purpose and expected input/output are entirely unclear beyond the generic 'Premium API Access' label.

Warnings

  • —No request or response schema documented — input format for POST body is unknown
  • —This endpoint targets a hardcoded email ID (75); unclear if other IDs are available or what data is returned
  • —The /api/v1/emails/* path is not listed among the site's advertised API categories
  • —Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:21:39Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/LCjhLk
Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request). — Clawmart · Clawmart