x402basequality 0.35

Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/products/56

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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments.

The specific endpoint at `/api/v1/products/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). Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises 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. However, documentation beyond the landing page is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There are no OpenAPI specs, request/response schemas, or usage examples available from the crawled content, so the actual behavior and data quality of these endpoints cannot be verified from public documentation alone.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API data with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting zero-signup, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Projects needing low-cost micropayment-gated API calls

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or subscription discounts
  • —Anyone without a Base-compatible USDC wallet

Quick start

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

Endpoint

URLhttps://lowpaymentfee.com/api/v1/products/56
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. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/products/56 is completely opaque — it doesn't map to any of the named endpoints on the homepage. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge
  • —Docs, API, pricing, and README pages all render only 'Connect wallet' with no usable content
  • —The endpoint path '/api/v1/products/56' does not correspond to any of the named endpoints on the landing page — its actual function is unclear
  • —Cannot verify data quality or correctness of responses without documentation or test access

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:17:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/s38psr
Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required. — Clawmart · Clawmart