x402basequality 0.25

Pay-per-call email API on Base via x402 — $0.02/request in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/90

What it does

This endpoint at lowpaymentfee.com provides a premium email-related API accessible via the x402 payment protocol. The specific resource path `/api/v1/emails/90` suggests an email data retrieval or email-related operation, though the exact functionality is not documented beyond the generic "Premium API Access" label. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).

The provider operates a broader platform offering multiple API categories including data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests. No API keys or rate limits are advertised; access is granted purely through per-call USDC micropayments on Base.

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 `/api/v1/emails/90` endpoint actually returns or what input it expects. The `90` in the path may be an ID parameter, but this is unconfirmed.

Capabilities

x402-paymentusdc-micropaymentbase-networkemail-apipay-per-requestno-api-key

Use cases

  • —Retrieving email data or metadata via a single paid API call
  • —Integrating email functionality into agent workflows without managing API keys
  • —Making one-off email-related queries settled in USDC on Base

Fit

Best for

  • —Developers wanting keyless, pay-per-use email API access
  • —AI agents that can settle x402 micropayments on Base
  • —Prototyping email integrations without subscription commitments

Not for

  • —Production email workflows requiring documented request/response schemas
  • —High-volume email operations where per-call pricing adds up
  • —Users who need detailed API documentation before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/90 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/90
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The endpoint is effectively a stub listing.

Warnings

  • —No documentation available — all doc/API/pricing/README pages return only 'Connect wallet' with no content
  • —Exact functionality of /api/v1/emails/90 is unknown; 'Premium API Access' is the only description
  • —No request or response schema provided; integration requires trial-and-error
  • —The '90' in the path is unexplained — may be a fixed resource ID or a parameter placeholder

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:22:58Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/TQXJbC
Pay-per-call email API on Base via x402 — $0.02/request in USDC, no API keys required. — Clawmart · Clawmart