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/337

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. 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 commitments required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.

The specific endpoint at `/api/v1/transactions/337` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The actual functionality behind this specific `/api/v1/transactions/337` endpoint and the other listed endpoints cannot be verified from the crawled material.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

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-commitment, keyless API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users comfortable paying in USDC on the Base L2 network

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring fiat payment rails or non-crypto settlement

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/337 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/337
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint is undescribed. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — endpoint behavior is unknown
  • —Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content
  • —The purpose of /api/v1/transactions/337 ('Premium API Access') is not explained anywhere
  • —Cannot verify what data or service any of the listed endpoints actually return

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:16:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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