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Best pay-per-call echo analytics APIs for AI agents (September 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Sep 29, 2026 · 8 agents searched Zero for this in the last 90 days

Zero indexes 26 pay-per-call services for echo analytics. Of the 10 ranked here, 9 answered a live probe in the last 7 days. Quoted prices run from $0.005 to $0.05 per call, median $0.02, paid per call over x402 or MPP with no API key. The one with real agent usage in the last 30 days is Google Trends Interest Over Time. The cheapest live option is x402 Market Intelligence Monitor at $0.005.

  1. api.kadec0.xyzGoogle Trends Interest Over Time1x402

    Returns a dated time series (indexed 0–100) of Google search interest for a keyword, with configurable time window and optional country filter.

    $0.05/message

    Live · checked Oct 1, 20261 call · 30 days

  2. monitor.memoryapi.orgx402 Market Intelligence Monitor2.7(1)1x402

    Returns on-chain x402 transaction history, agentic market service counts by category, and ecosystem trends for the x402 micropayment protocol

    $0.005/message

    Live · checked Oct 2, 20260 calls · 30 days

  3. agent402.toolsagent402.tools Onchain SQL2x402

    Run read-only ClickHouse SQL queries against decoded, indexed blockchain data for Base, Base Sepolia, Solana, and HyperEVM networks

    $0.02/message

    Live · checked Oct 1, 20260 calls · 30 days

  4. x402scan-j55w7ornb-merit-systems.vercel.appx402scan Merchant Statsx402

    Returns aggregated merchant metrics (total revenue, transaction count, unique buyers, and latest block timestamp) for a specific merchant address on the x402 payment network.

    $0.01/message

    Live · checked Oct 1, 20260 calls · 30 days

  5. api.jubjubapp.comJubJub Content Performance Analyticsx402

    Returns cross-platform performance analytics for a specific content item, including views, engagement, watch time, on-chain streaming revenue, and token-holder data.

    $0.005000/message

    Live · checked Sep 30, 20260 calls · 30 days

  6. instagram.withzero.aiInstagram WithZero Operator Usage & Revenue Dashboardmpp

    Returns aggregated usage statistics and revenue data for the operator's Instagram data service instance.

    —/message

    Live · checked Oct 1, 20260 calls · 30 days

  7. x402ads.iox402ads.io Agent Analyticsx402

    Returns analytics on x402 agent activity and ad performance metrics (impressions, conversions, deposits) over a configurable time window.

    $0.02/message

    Live · checked Sep 30, 20260 calls · 30 days

  8. spend.crestsystems.aix402 Market Overview APIx402

    Returns a real-time overview of the x402 payment ecosystem including top services by revenue, price distribution, hourly volume, and ecosystem health score.

    $0.010000/message

    Not verified recently0 calls · 30 days

  9. instagram-data.withzero.aiInstagram Data Service - Aggregated Usage & Revenue (Operator Spend)mpp

    Returns aggregated usage statistics and revenue figures for the operator's own account on the instagram-data.withzero.ai service.

    —/message

    Live · checked Oct 2, 20260 calls · 30 days

  10. gateway.sanfoundation.comSAN Foundation Agent Events Feedx402

    Returns recent canonical events for a specified SAN agent, with each event collapsing matching source articles into a single deduplicated record including source count and sources array.

    $0.03/message

    Live · checked Oct 2, 20260 calls · 30 days

Call one from an agent

zero fetch --capability google-trends-interest-over-time-b92770b0 --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.