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/71/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 71) 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 provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/emails/71/attachments` endpoint. The endpoint's purpose and response schema are not documented beyond the generic "Premium API Access" label, so the exact structure of the returned attachment data is unknown.

The endpoint is live: it returns a well-formed x402 version 1 challenge with an "exact" payment scheme targeting USDC (contract 0x8335…2913) on Base. The payment recipient is 0x1A2B…85F3 with a 300-second timeout. No OpenAPI spec, detailed docs, or example responses were found in the crawl — the docs, pricing, and API pages all render only a wallet-connect prompt with no additional technical content.

Capabilities

x402-paymentemail-attachmentsusdc-basemicropaymentpost-endpoint

Use cases

  • —Programmatically retrieving email attachments via a pay-per-request model
  • —Agent-driven workflows that need to fetch specific email attachment data without API key provisioning
  • —Demonstrating x402 micropayment integration on the Base network

Fit

Best for

  • —Agents or scripts that need one-off email attachment retrieval without signup
  • —Developers experimenting with x402 payment protocol on Base
  • —Workflows requiring keyless, pay-as-you-go API access

Not for

  • —Bulk email processing or high-volume attachment downloads (no documented batch support)
  • —Users who need detailed documentation or guaranteed SLAs
  • —Accessing arbitrary email IDs (this endpoint is hardcoded to email 71)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/71/attachments \
  -H "X-PAYMENT: <x402_payment_token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/71/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 OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond a wallet-connect prompt. The endpoint path suggests a single hardcoded email ID (71), and the purpose of the attachment data is unclear. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — request body and response format are unknown.
  • —Endpoint is scoped to a single email ID (71); unclear if other email IDs are supported.
  • —Docs, pricing, and API pages render only a wallet-connect prompt with no technical content.
  • —The exact nature of the 'email attachments' data is undocumented — could be demo/test data.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:19:06Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/G4ySBh
Retrieve email attachments via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart