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/36/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 36) 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 subscriptions required.

The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto data feeds, and infrastructure utilities — all priced at $0.02 per request. However, this specific endpoint (/api/v1/emails/36/attachments) is not listed on the provider's landing page among the advertised API categories. Its purpose — retrieving attachments for a specific email — is unclear in context, and no documentation, request schema, or response schema is available beyond the x402 challenge itself.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with x402Version 1, scheme "exact", paying to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The timeout is 300 seconds. No OpenAPI spec, AI plugin manifest, or detailed documentation was found during crawling.

Capabilities

x402-paymentemail-attachmentsusdc-basemicropaymentpost-endpointjson-response

Use cases

  • —Retrieving email attachments programmatically via a pay-per-request model
  • —Agent-driven workflows that need to fetch specific email content without API key management
  • —Demonstrating x402 micropayment integration on Base network

Fit

Best for

  • —Developers experimenting with x402 payment protocol on Base
  • —Agents that need keyless, pay-per-call access to email data
  • —Low-volume attachment retrieval without subscription overhead

Not for

  • —Bulk email processing or high-volume attachment downloads (no documented batch support)
  • —Users who need detailed API documentation or guaranteed SLAs
  • —General-purpose email management (this targets a single email resource)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/36/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/36/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the endpoint is not listed among the provider's advertised APIs. The purpose of accessing 'email 36 attachments' is unexplained, making this effectively a stub listing.

Warnings

  • —This specific endpoint (/api/v1/emails/36/attachments) is not listed among the provider's advertised API categories — its purpose and data source are unclear.
  • —No request body schema or response schema is documented anywhere.
  • —All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no usable content.
  • —The endpoint targets a hardcoded email ID (36), suggesting it may be a demo or test resource rather than a general-purpose API.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:05:29Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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