x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/387

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, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme. No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof.

The specific endpoint at `/api/v1/payments/387` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is directed 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 pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented and unverified.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keydata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-quotesgeocodingutility-services

Use cases

  • —Agent-driven API calls without pre-registration or API key management
  • —Micropayment-gated access to AI inference (sentiment, summarization, classification, embeddings)
  • —On-demand financial data retrieval (prices, exchange rates, gas estimates)
  • —Utility operations like geocoding, validation, and data conversion

Fit

Best for

  • —AI agents needing frictionless, keyless API access via x402
  • —Developers who want pay-as-you-go pricing with no commitments
  • —Applications requiring diverse lightweight API calls at low cost

Not for

  • —High-volume batch processing where per-call fees add up quickly
  • —Users who need detailed API documentation or guaranteed SLAs
  • —Callers without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/387 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/387
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response formats, and all documentation pages return only 'Connect wallet' with no content. The actual functionality behind 'Premium API Access' at /api/v1/payments/387 is unspecified. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all return only 'Connect wallet'
  • —No request or response schema provided for this endpoint or any other listed endpoint
  • —The purpose of '/api/v1/payments/387' ('Premium API Access') is vague and not explained anywhere
  • —Cannot verify what data or service is actually returned upon successful payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:23:04Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/7AD4pr
Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart