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/287

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required.

The specific endpoint at `/api/v1/transactions/287` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts HTTP POST 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 essentially empty (all doc/pricing/API pages just show "Connect wallet"), so the actual functionality, request schemas, and response formats for each endpoint are unknown.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apihttp-post

Use cases

  • —Accessing premium API data without API key registration
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven workflows needing frictionless per-call payment

Fit

Best for

  • —Developers wanting zero-signup, pay-as-you-go 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 request/response schemas before purchasing
  • —High-volume use cases where per-call pricing becomes expensive
  • —Users without USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/287 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/287
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the docs/pricing/API pages are all blank ('Connect wallet' only). The actual functionality behind 'Premium API Access' at /api/v1/transactions/287 is completely opaque.

Warnings

  • —No documentation available — all doc pages render only 'Connect wallet'
  • —No OpenAPI or request/response schema provided for any endpoint
  • —The specific purpose of /api/v1/transactions/287 ('Premium API Access') is unclear and not described anywhere
  • —Cannot verify what data or service is actually returned after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:01:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/w2XEC9
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart