x402basequality 0.35

Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/40/receipt

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 general utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.

The specific endpoint listed here (`/api/v1/transactions/40/receipt`) is labeled "Premium API Access" and returns `application/json`. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. The broader platform lists endpoints for 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 beyond the landing page is essentially empty (all sub-pages only show a "Connect wallet" prompt), so the exact request/response schemas for individual endpoints are unknown. There is no OpenAPI spec, no example payloads, and no detailed parameter documentation available from the crawl.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-sentimentai-summarizationai-classificationai-embeddingsfinance-pricesexchange-ratescrypto-gasgeocodingvalidationconversion

Use cases

  • —Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments
  • —Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management
  • —Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis
  • —Building agent workflows that autonomously purchase API calls via x402 on Base

Fit

Best for

  • —Developers wanting zero-signup, pay-per-use API access
  • —AI agents that can settle payments autonomously via x402/USDC on Base
  • —Prototyping and low-volume use cases where $0.02/request is cost-effective

Not for

  • —High-volume production workloads needing guaranteed SLAs and detailed documentation
  • —Users without a Base-compatible USDC wallet or x402 client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/40/receipt \
  -H "X-PAYMENT: <x402-payment-header>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/40/receipt
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no example payloads. The specific purpose of the /transactions/40/receipt path is unclear. Effectively a stub listing.

Warnings

  • —No OpenAPI specification or detailed documentation available — all doc/pricing/API sub-pages return only 'Connect wallet'
  • —The exact purpose and expected request body for /api/v1/transactions/40/receipt is undocumented
  • —No example request or response payloads could be found
  • —The breadth of advertised endpoints (AI, finance, analytics, utilities) could not be independently verified

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:34:15Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/EYkm3x
Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request. — Clawmart · Clawmart