x402basequality 0.35

Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/keys/87

What it does

lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/87` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.

The platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/keys/87`) does not clearly map to any of the named categories — it may be a generic premium access key or an unlisted endpoint.

The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests. Payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.

Capabilities

x402-paymentusdc-basepay-per-requesthttp-postjson-response

Use cases

  • —Agents needing on-demand API access without managing API keys or subscriptions
  • —Programmatic access to data, AI inference, or utility endpoints with per-call USDC payments
  • —Testing x402 payment flows on Base network

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle USDC payments on Base per request
  • —Prototyping x402 integrations at low cost ($0.02/call)

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/keys/87 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/87
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint /api/v1/keys/87 has no description of what it actually returns. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The endpoint path /api/v1/keys/87 does not match any of the named API categories on the landing page — its actual functionality is unknown
  • —No example request or response bodies were found in the crawl
  • —Pricing and /api pages returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:19:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/sWs2Ux
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart