x402basequality 0.40

Pay-per-call API platform on Base (USDC) covering 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/invoices/32

What it does

lowpaymentfee.com is an x402-enabled API marketplace that offers a broad set 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 via the x402 protocol — no API keys, no rate limits, no subscriptions.

The specific endpoint at `/api/v1/invoices/32` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-datageocodingutility-services

Use cases

  • —Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys
  • —Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call billing
  • —Geocoding or data validation as a utility service paid per request via x402
  • —Exporting data or generating analytics reports with no subscription commitment

Fit

Best for

  • —AI agents needing keyless, pay-per-call access to diverse API endpoints
  • —Developers who want to avoid API key management and subscription overhead
  • —Low-volume or bursty workloads where $0.02/request flat pricing is economical

Not for

  • —High-volume production workloads where per-request costs would accumulate significantly
  • —Users who need detailed SLAs, guaranteed uptime, or enterprise support
  • —Anyone without access to USDC on the Base network for payment

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/invoices/32 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/invoices/32
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages behind the wallet gate yielded no content. The specific purpose of `/api/v1/invoices/32` ("Premium API Access") is vague — it's unclear what data or service it actually returns.

Warnings

  • —Documentation pages (/docs, /api, /pricing, /README) all appear gated behind wallet connection and returned no useful content.
  • —The specific endpoint /api/v1/invoices/32 has a generic description ('Premium API Access') with no schema or documentation explaining what it actually does.
  • —No OpenAPI spec or request/response schema is available for any endpoint.
  • —The platform lists many endpoints on its landing page but none have documented input/output contracts in the crawled material.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:37:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/J6cFfr
Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart