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/56

What it does

lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.

The specific endpoint `/api/v1/cards/56` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.

Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind `/api/v1/cards/56` is unclear from the available material; the generic "Premium API Access" label does not describe what data or service it provides.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responsehttp-postno-api-keyno-rate-limit

Use cases

  • —Agents needing on-demand API access without pre-registration or API keys
  • —Micropayment-gated data retrieval settled in USDC on Base
  • —Programmatic access to analytics, AI inference, finance data, or utility services at $0.02/call

Fit

Best for

  • —AI agents with x402-compatible wallets looking for frictionless API access
  • —Developers wanting pay-as-you-go endpoints with no subscription
  • —Use cases requiring low-cost per-request pricing on Base L2

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume batch workloads where per-request pricing may add up
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/56 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/56
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schemas, no examples, and the docs pages are empty. The purpose of /api/v1/cards/56 specifically is unclear. Pricing is clear ($0.02/request in USDC on Base).

Warnings

  • —No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'
  • —The specific purpose of /api/v1/cards/56 ('Premium API Access') is not described anywhere
  • —No request body schema or response schema documented
  • —The broader catalog lists many endpoints but none have documented input/output formats

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:01:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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