x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/161

What it does

lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/161` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02 per call (USDC uses 6 decimals).

The platform advertises categories including 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 (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02 price point. Payment is made via the x402 protocol's exact payment scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

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 spec, no request/response schema documentation, and no examples of what this specific endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what data or functionality "Premium API Access" at `/api/v1/transactions/161` actually provides.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyno-rate-limitjson-response

Use cases

  • —Accessing premium data or transaction information via a single paid API call
  • —Integrating pay-per-use API endpoints into agent workflows without managing API keys
  • —Making low-cost programmatic requests settled in USDC on Base

Fit

Best for

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

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/161 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/161
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response format, and no examples. The purpose of this specific endpoint ('Premium API Access' at /transactions/161) is entirely opaque. Docs pages return only 'Connect wallet' with no content.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format for this endpoint
  • —The purpose and output of /api/v1/transactions/161 ('Premium API Access') is unclear — could be anything
  • —Cannot verify what data or service is actually delivered after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:16:28Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/T3D8qt
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart