x402basequality 0.35

x402-gated API platform on Base 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/cards/45

What it does

lowpaymentfee.com is an x402-protocol API platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/45` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.

The broader platform advertises four 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/cards/45` endpoint specifically returns. The endpoint is live and responds with a valid x402 402 challenge, but without documentation it is unclear what payload to send or what response to expect.

Capabilities

x402-paymentusdc-baseper-request-micropaymentdata-analyticsai-inferencefinance-datacrypto-datageocodingtext-summarizationsentiment-analysisembeddingsclassification

Use cases

  • —Accessing data analytics and reports without API key management
  • —Running AI inference (sentiment, summarization, classification, embeddings) via pay-per-call
  • —Fetching crypto token quotes and gas estimates on demand
  • —Geocoding and data conversion utilities with no subscription

Fit

Best for

  • —Agents or developers wanting zero-signup, pay-per-use API access
  • —Prototyping workflows that need diverse utility endpoints without rate limits
  • —x402-native agents that can settle USDC micropayments on Base

Not for

  • —High-volume production workloads where $0.02/request adds up significantly
  • —Users who need detailed API documentation or guaranteed SLAs before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/45 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/45
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/cards/45 actually returns. The listing is effectively a stub with confirmed liveness.

Warnings

  • —No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format for /api/v1/cards/45
  • —The specific purpose of the /api/v1/cards/45 endpoint is unknown beyond the generic label 'Premium API Access'
  • —Cannot verify that the advertised AI, finance, and utility endpoints actually function as described

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:51:48Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/LTwdxB
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart