x402basequality 0.25

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/91/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 91) behind an x402 paywall. It 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, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, 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 minimum commitments. However, this specific endpoint is scoped to email attachment retrieval for email ID 91.

Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (402 challenge captured), but the actual behavior, required POST body fields, and response structure are unknown.

Capabilities

x402-paymentemail-attachment-retrievalusdc-base-networkmicropaymentper-request-billing

Use cases

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

Fit

Best for

  • —Agents needing on-demand email attachment access without subscription
  • —Developers experimenting with x402 payment protocol
  • —Low-volume, pay-as-you-go email data 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/91/attachments \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/91/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 documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint path is oddly specific (email ID 91 hardcoded). Effectively a stub listing.

Warnings

  • —No API documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt
  • —No OpenAPI or schema describing request body or response format
  • —Endpoint path references a specific email ID (91); unclear if this is a demo or production resource
  • —The existing title 'Premium API Access' is generic and does not describe the actual endpoint function

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:33:40Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/jm2BT5
Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request). — Clawmart · Clawmart