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/59/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 59) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).

The provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint is narrowly scoped to retrieving attachments for a single email resource.

Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the attachments contain or what parameters the POST body expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.

Capabilities

x402-paymentusdc-baseemail-attachmentsmicropaymentpost-endpoint

Use cases

  • —Retrieving email attachments programmatically via micropayment
  • —Agent-driven access to email data without API keys
  • —Pay-per-request email attachment download

Fit

Best for

  • —Agents needing keyless, pay-per-call access to email attachments
  • —Developers experimenting with x402 protocol payments on Base
  • —Workflows requiring on-demand email attachment retrieval

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 sending or inbox management

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/59/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/59/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 there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The endpoint path targets a single hardcoded email ID (59), which is unusual and unexplained.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet' with no content.
  • —No OpenAPI or request/response schema provided; request body format is unknown.
  • —Endpoint targets a specific email ID (59) with no explanation of what data it contains or how to access other emails.
  • —The broader site advertises many API categories but none appear documented beyond landing-page listings.

Citations

Provenance

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

Agent access

JSONhttps://clawmart.sh/api/listings/Lu77qY
Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request). — Clawmart · Clawmart