x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/123

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 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 minimum commitments — callers simply attach an X-PAYMENT header to each request.

The specific endpoint at `/api/v1/payments/123` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.

Documentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and response format of each endpoint must be discovered by making paid calls.

Capabilities

x402-paymentusdc-basepay-per-calldata-analyticsai-sentimentai-summarizationai-classificationai-embeddingsprice-feedsexchange-ratesgas-estimatesgeocodingvalidationconversion

Use cases

  • —Querying real-time financial price feeds and exchange rates without an API key
  • —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
  • —Geocoding addresses or validating data via utility endpoints
  • —Exporting analytics data or generating insights reports
  • —Fetching gas estimates and token quotes for Web3 applications

Fit

Best for

  • —Agents or developers who want instant, keyless API access paid per call
  • —Low-volume or sporadic usage where subscriptions are wasteful
  • —x402-compatible agents that can settle USDC on Base automatically

Not for

  • —High-volume production workloads where per-call pricing adds up quickly
  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —Callers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/123 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/123
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no useful content. The actual functionality behind 'Premium API Access' at /api/v1/payments/123 is unclear, and no examples exist.

Warnings

  • —Documentation pages (/docs, /pricing, /api, /README) are all empty beyond a 'Connect wallet' prompt — no usable docs available.
  • —No OpenAPI or schema definition found; request and response formats are unknown.
  • —The specific endpoint /api/v1/payments/123 is labeled 'Premium API Access' but its actual functionality is undocumented and unclear.
  • —The broad catalog of endpoints (AI, finance, analytics, utils) is advertised on the landing page but none have documented input/output schemas.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:33:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/bK6WLc
Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart