x402basequality 0.30

Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/22

What it does

This x402-enabled endpoint at `/api/v1/emails/22` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract `0x8335…2913`) with no API keys, no rate limits, and no subscriptions required — just an x402 payment header per request.

The specific endpoint probed (`/api/v1/emails/22`) is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms a max amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.

Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/22` endpoint actually returns. The endpoint path suggests email-related data retrieval (possibly fetching a specific email record by ID), but this is speculative. The platform advertises categories like analytics, AI, finance, and infrastructure utilities, but this particular endpoint's category and response format are undocumented.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyemail-data

Use cases

  • —Retrieving email-related data on a per-request payment basis
  • —Integrating pay-per-use email data into agent workflows without API key management
  • —Programmatic access to email records settled via crypto micropayments

Fit

Best for

  • —Agents or developers wanting keyless, pay-per-call API access
  • —Use cases requiring crypto-native micropayment settlement on Base
  • —Quick integration without subscription commitments

Not for

  • —Users needing well-documented APIs with clear request/response schemas
  • —High-volume use cases where per-request pricing may add up
  • —Anyone requiring fiat-only payment rails

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/22 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/22
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, no description of what the endpoint actually does beyond the generic label 'Premium API Access'. The function of /api/v1/emails/22 is unclear.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format
  • —The purpose of /api/v1/emails/22 is undocumented; 'Premium API Access' is a generic label
  • —Cannot verify what data is returned without making a paid request

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:03:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/hfUMKj
Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call. — Clawmart · Clawmart