{"service":"x402 Intelligence API","summary":"Supply and demand of the x402 agentic-payment economy, measured against the chain. Descriptive, dated, window-bounded evidence — never a forecast and never a fraud allegation.","beforeYouPay":"Read this first. The headline numbers these routes return are also published for free: https://x402intel.uk/data/x402-market.json answers how big the market is, and the observatory publishes the snapshot and the on-chain cross-check behind it. Each paid route below declares its free substitute and exactly what it adds. Fetch the free files first and pay only for the difference.","payment":{"protocol":"x402","version":2,"priceDecimal":"$0.05","priceAtomic":"50000","asset":{"symbol":"USDC","address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"network":{"symbolic":"base","caip2":"eip155:8453"},"payTo":"0x7b13107779CfDA1bEba3289d0Fbe27310436f3E3","header":"PAYMENT-SIGNATURE","billing":"Any response with status 400 or above cancels settlement, so you are not charged for malformed input (400) or for an unavailable artifact (503). You are charged only for a 200."},"freshness":"Each response carries its own measuredAsOf. The catalogue snapshot and the on-chain cross-check are refreshed on a timer, and the response states the window it covers rather than implying it is live.","free":[{"url":"https://x402intel.uk/data/x402-market.json","what":"the headline of the x402 market as JSON-LD: ecosystem floor and upper bound (not additive), buyer structure and the seller verdict mix, with the measurement contract attached"},{"url":"https://observatory.x402intel.uk/data/latest.json","what":"the current catalogue snapshot the dashboard reads, seller by seller"},{"url":"https://observatory.x402intel.uk/data/onchain.json","what":"the Base settlement cross-check behind the demand figures, with the verdict per seller"},{"url":"https://observatory.x402intel.uk/data/catalog-history.json","what":"how the catalogue moved over time, so a change in coverage is not read as a change in the market"},{"url":"https://observatory.x402intel.uk/data/ecosystem-coverage.json","what":"which chains are measured, by which method, and which are withheld"},{"url":"https://observatory.x402intel.uk/data/solana-buyers.json","what":"the Solana side, kept separate because its buyer identity is an owner, not an authority"},{"url":"https://x402intel.uk/llms.txt","what":"how to read the published artifacts, and their caveats"}],"paid":[{"method":"GET","url":"https://api.x402intel.uk/x402-market","description":"x402 market intelligence with current catalog-attributed USDC flow, address-level demand signals and separately labeled value-matched history. The headline covers Base only (market.universeChains); the multi-chain picture ships alongside it as ecosystem, split into an RPC-proven floor and an indexed upper bound that are not additive (notASum). Attribution is not exclusive protocol-intent proof.","freeSubstitute":"https://x402intel.uk/data/x402-market.json","residual":"The free file answers how big the market is. This route adds the shape of it: the ranked sellers with their ticket size and sub-cent share, the concentration of demand, the settlements per buyer, and the month-by-month series behind the headline. If you only need the headline, take the free file."},{"method":"GET","url":"https://api.x402intel.uk/x402-authenticity/:payTo","description":"x402 seller attribution intelligence: reported calls versus catalog-attributed on-chain USDC flow, payer-address concentration and forensic signals. Attribution is not protocol or fraud proof.","freeSubstitute":null,"residual":"A lookup by seller address. Nothing we publish, and nothing we know of elsewhere, answers 'what does the chain say about THIS payTo' without downloading and joining the whole cross-check yourself. The verdict is a triage label over attributed settlements, never a certificate of authenticity, and the response says so."}],"notAClaim":["Attribution is not exclusive proof of protocol intent: a USDC transfer that matches a catalogue price is evidence, not a receipt.","The ecosystem floor and the upper bound are not additive and must never be summed — they are two different measurements of overlapping ground.","A seller verdict is a triage label computed from observable concentration, not an accusation of fraud.","Coverage is per chain and declared. A chain we do not measure is withheld, never counted as zero."]}