x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

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

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/61` is listed as "Premium API Access" and returns `application/json` via POST.

The platform advertises four main categories of APIs: 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 (geocoding, validation, conversion, generation). All endpoints follow the x402 payment protocol, where callers attach a payment header with each request and settlement occurs on-chain via USDC on Base.

Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The x402 challenge for this specific endpoint confirms it is live and accepts payments up to 20,000 base units of USDC (i.e., $0.02) on Base network.

Capabilities

x402-paymentusdc-base-networkpay-per-requestjson-apino-api-keypost-method

Use cases

  • —Accessing premium API data without traditional API key registration
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven workflows that need instant, keyless API access with on-chain payment

Fit

Best for

  • —Developers who want keyless, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who want bulk pricing or subscription discounts
  • —Developers who cannot transact in USDC on the Base network

Quick start

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

Endpoint

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

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schema, and no documentation beyond a landing page. The actual functionality behind '/api/v1/transactions/61' is entirely opaque — 'Premium API Access' is not descriptive. Docs pages all render only 'Connect wallet' with no content.

Warnings

  • —No OpenAPI spec or request/response schema available
  • —Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt
  • —The specific functionality of /api/v1/transactions/61 ('Premium API Access') is undocumented and unclear
  • —Cannot verify what data or service this endpoint actually returns

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:52:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/ppHSzJ
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart