x402basequality 0.30

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/charges/307

What it does

lowpaymentfee.com is an x402-protocol API platform that provides a collection of pay-per-call endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network.

The specific endpoint at `/api/v1/charges/307` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335...2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.

Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the "Premium API Access" endpoint actually returns. The platform's landing page lists many endpoints but provides no detail on input parameters or response formats for any of them. Without documentation, it is unclear what data or functionality this specific endpoint provides.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkjson-apino-api-keyno-rate-limit

Use cases

  • —Accessing pay-per-call API services without subscriptions or API keys
  • —Making micropayments for individual API requests using USDC on Base
  • —Agent-driven API consumption with x402 payment protocol

Fit

Best for

  • —Developers wanting zero-commitment pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Users without access to USDC on the Base network

Quick start

# Send a POST with x402 payment header to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/charges/307 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/307
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The 'Premium API Access' label is generic and it's unclear what this specific endpoint actually does. All non-landing crawled pages returned only 'Connect wallet' with no content.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no content
  • —No OpenAPI or schema definition found for any endpoint
  • —The purpose and functionality of /api/v1/charges/307 ('Premium API Access') is entirely undocumented
  • —No request parameters or response format information available
  • —Cannot verify what data or service this endpoint actually provides

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:54:09Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

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