Measure the markets and infrastructure shaping the machine economy.

Machine Observer reads payment challenges from a bounded sample of machine-payable endpoints without paying, preserving advertised asking prices separately from settlements. First-party measurement; asking prices are not transactions.

Screens x402 settlement activity for self-payments, concentrated flows and behavioral signals, then estimates a bounded share that appears agentic.

Open machine-readable dataset tracking x402, ERC-8004, Virtuals ACP, Olas, Tempo MPP and Base agentic activity.

Continuously probes discoverable x402 services and grades whether agents can discover, pay and parse them.

Exact-route x402 quote validity, freshness, provider concentration and paid-call evidence.

Living reference spanning substrate, identity, authorization, commerce and settlement layers.

Multichain ERC-8004 identity, feedback, validation and reproducible reputation explorer with an x402 REST API.

Discovery and activity surface for x402 servers and resources, including per-service transactions, volume and buyers.

Public read-only current-draw endpoint for an x402-paid agent lottery. Machine Observer observes draw activity but never purchases tickets.

Continuously organized index of open-source x402, MPP, AP2, ACP, A2A, L402 and MCP projects.

x402 TypeScript core SDK; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

x402 Python SDK; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

Machine-readable directory of live websites exposing WebMCP tools to AI agents.

Probe-derived machine-readable directory of x402 operators, endpoint availability, delivery evidence and service capabilities.

Screens x402 settlement activity for self-payments, concentrated flows and behavioral signals, then estimates a bounded share that appears agentic.

Open machine-readable dataset tracking x402, ERC-8004, Virtuals ACP, Olas, Tempo MPP and Base agentic activity.

Continuously probes discoverable x402 services and grades whether agents can discover, pay and parse them.

Exact-route x402 quote validity, freshness, provider concentration and paid-call evidence.

Living reference spanning substrate, identity, authorization, commerce and settlement layers.

Multichain ERC-8004 identity, feedback, validation and reproducible reputation explorer with an x402 REST API.

Independent index of authorized AI voice and likeness licensing offers with source-level provenance and change history. First-party constituent; scored under the same rules as external sources.

Machine Observer reads payment challenges from a bounded sample of machine-payable endpoints without paying, preserving advertised asking prices separately from settlements. First-party measurement; asking prices are not transactions.

Continuously probes discoverable x402 services and grades whether agents can discover, pay and parse them.

Discovery and activity surface for x402 servers and resources, including per-service transactions, volume and buyers.

Continuously organized index of open-source x402, MPP, AP2, ACP, A2A, L402 and MCP projects.

CC0 machine-readable directory of public OpenAPI descriptions with API, provider and endpoint metrics.

Searches US real-estate listings, property details and Zestimate fields through an x402-gated endpoint.

Searches current public sale and rental listings by market, ZIP, address, property ID, price and property attributes.

Looks up as many as three properties per call with address, price, status, beds, baths and agent contact fields.

Extracts property data from supported listing URLs and produces calculator-specific real-estate underwriting.

Town-level HDB resale statistics plus documented condo, landed-property and REST/MCP coverage.

Publishes land-price feeds, national indexes and RWA-oriented valuation fields in Chainlink-compatible formats.

Machine-payable UK property endpoints including HMO licence checks, postcode lookup and licence details.

CC-BY machine-readable model pricing and deprecation data for major inference providers.

American Community Survey housing, tenure, occupancy, rent, value and demographic measures for national, state and local property analysis.

HUD public datasets spanning fair-market rents, income limits, housing affordability, assisted housing and market conditions.

National Flood Hazard Layer map-service metadata and flood-risk geospatial layers used for parcel and property physical-risk analysis.

EPA facility, enforcement, compliance and environmental-site records useful for environmental due diligence and property-risk screening.

Federal Housing Finance Agency house-price indexes covering national, state, metro and other geographies.

Federal Reserve Bank of St. Louis FRED distribution of U.S. housing-price and related macroeconomic series, retaining original source attribution.

U.S. Bureau of Transportation Statistics freight shipment values by transportation mode and year, exposed through the BTS Socrata API.

SEC machine-readable company, CIK, ticker and exchange registry for public filers and listed securities.

Federal Register API records for Securities and Exchange Commission rules, notices, proposed rules and other published regulatory documents.

Official public discovery API for registered MCP servers; Machine Observer measures recent registry supply changes.

official MCP TypeScript SDK; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

official A2A JavaScript SDK; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

Streamable HTTP MCP server framework; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

official MCP Python SDK; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

FastMCP Python framework; registry download activity used as an ecosystem signal rather than a count of unique users or deployments.

Machine-readable directory of live websites exposing WebMCP tools to AI agents.

Probe-derived machine-readable directory of x402 operators, endpoint availability, delivery evidence and service capabilities.

Searches US real-estate listings, property details and Zestimate fields through an x402-gated endpoint.

Searches current public sale and rental listings by market, ZIP, address, property ID, price and property attributes.

Looks up as many as three properties per call with address, price, status, beds, baths and agent contact fields.

Extracts property data from supported listing URLs and produces calculator-specific real-estate underwriting.

Town-level HDB resale statistics plus documented condo, landed-property and REST/MCP coverage.

Publishes land-price feeds, national indexes and RWA-oriented valuation fields in Chainlink-compatible formats.

Machine-payable UK property endpoints including HMO licence checks, postcode lookup and licence details.

American Community Survey housing, tenure, occupancy, rent, value and demographic measures for national, state and local property analysis.

HUD public datasets spanning fair-market rents, income limits, housing affordability, assisted housing and market conditions.

National Flood Hazard Layer map-service metadata and flood-risk geospatial layers used for parcel and property physical-risk analysis.

EPA facility, enforcement, compliance and environmental-site records useful for environmental due diligence and property-risk screening.

County and local assessor systems for parcel boundaries, ownership, assessed value, tax characteristics and property attributes. Machine Observer treats each local portal as a separately provenance-bound source when admitted.

Municipal and county planning, permitting and zoning systems. Each admitted endpoint retains its jurisdiction, schema and provenance rather than being silently normalized into another dataset.

Federal Housing Finance Agency house-price indexes covering national, state, metro and other geographies.

Federal Reserve Bank of St. Louis FRED distribution of U.S. housing-price and related macroeconomic series, retaining original source attribution.

USDA Rural Development program, eligibility and rural-area information relevant to rural housing, land and property financing contexts.

State, county and municipal foreclosure, delinquent-tax and tax-sale records. Machine Observer admits jurisdictional sources separately and preserves their legal and temporal context.

Normalized public JSON of live cloud GPU rental prices across providers and GPU models.

CC-BY machine-readable model pricing and deprecation data for major inference providers.

Public machine-readable catalog of inference models, capabilities and per-token pricing.