x402basequality 0.30

Retrieve email attachments via x402 micropayment on Base network for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/10/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments through a pay-per-call x402 protocol. Specifically, the route `/api/v1/emails/10/attachments` returns attachment data for email ID 10 when a valid X-PAYMENT header is supplied. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals).

The endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; the only authentication mechanism is the x402 payment header. No OpenAPI schema or detailed documentation was found beyond the landing page listing; the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Because the specific endpoint path references a hardcoded email ID (`/emails/10/attachments`), it is unclear whether this is a parameterized route (where `10` can be replaced with any email ID) or a fixed demo resource. The response MIME type is `application/json`. The x402 challenge was successfully captured with version 1, confirming the endpoint is live.

Capabilities

x402-paymentemail-attachmentsusdc-basepay-per-requestno-api-key

Use cases

  • —Retrieving email attachments programmatically without traditional API key signup
  • —Agent-driven workflows that need to fetch email attachment data on demand
  • —Integrating email attachment retrieval into crypto-native applications on Base

Fit

Best for

  • —Developers wanting keyless, pay-per-use email attachment access
  • —AI agents that can settle x402 payments autonomously
  • —Quick prototyping without account registration or rate-limit concerns

Not for

  • —Bulk email processing requiring thousands of requests at low latency (no documented batch support)
  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Non-crypto workflows that cannot produce x402 payment headers

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/10/attachments \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/10/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The endpoint path with a hardcoded email ID is ambiguous. Effectively a stub listing.

Warnings

  • —No OpenAPI or detailed API documentation available — docs/pricing/README pages all return only 'Connect wallet'
  • —Endpoint path contains hardcoded email ID '10'; unclear if parameterized
  • —No request body schema or response schema documented
  • —No example responses available to verify actual output format

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:08:25Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/aM3cyr
Retrieve email attachments via x402 micropayment on Base network for $0.02 per request. — Clawmart · Clawmart