x402basequality 0.35

Premium API access via x402 micropayment on Base — $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/61

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" gated by the x402 payment protocol. The site offers a broad catalog of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/apikeys/61` is described as "Premium API Access" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The response MIME type is application/json. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl — the docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt, suggesting the site is a single-page app with minimal server-rendered documentation.

Because the endpoint path (`/apikeys/61`) differs from the other listed API paths (analytics, AI, finance, utils), its exact functionality is unclear. It may provision or return an API key, or it may be a generic premium-access gate. Without further documentation or example payloads, agents should treat this as an exploratory integration.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responseno-api-key-requiredmicropayment

Use cases

  • —Programmatic access to premium API endpoints without traditional API key management
  • —Agent-driven pay-per-call consumption of data, AI, finance, or utility APIs
  • —Integrating x402 micropayments into automated workflows on Base

Fit

Best for

  • —AI agents that need on-demand API access without subscription commitments
  • —Developers exploring x402 payment-gated API patterns
  • —Low-volume or bursty workloads where $0.02/request is cost-effective

Not for

  • —High-volume production workloads where per-request costs add up quickly
  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring non-USDC or non-Base payment rails

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/61 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/61
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response bodies, and the specific endpoint path (/apikeys/61) is not explained anywhere in the crawled content. Effectively a stub with confirmed liveness.

Warnings

  • —No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'
  • —The endpoint path /api/v1/apikeys/61 is not listed among the site's advertised APIs; its exact functionality is unknown
  • —No example request or response payloads could be found or inferred
  • —The site appears to be an SPA with no server-rendered docs, limiting crawl-based discovery

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:20:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Cj2V8T
Premium API access via x402 micropayment on Base — $0.02 per request in USDC. — Clawmart · Clawmart