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The first reply is HTTP 402 with a PAYMENT-REQUIRED header (base64 JSON). Sign it, send PAYMENT-SIGNATURE and retry the same request. The paid reply carries PAYMENT-RESPONSE.","mcp_endpoint":"https://horse-truth-edge-production.up.railway.app/api/v1/mcp","name":"paid_call","step":4,"x402_routes":[{"method":"GET","operation":"resolve_horse","price":"$0.001","price_usd":0.001,"url_template":"https://horsetruth.com.au/api/v1/x402/resolve-horse?q={horse_name}"},{"method":"GET","operation":"horse_changes","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-changes?horse={horse_name}"},{"method":"GET","operation":"horse_compare","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-compare?horses={horses}"},{"method":"GET","operation":"horse_explanation","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-explanation?horse={horse_name}"},{"method":"GET","operation":"horse_intelligence","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-intelligence?horse={horse_name}"},{"method":"GET","operation":"horse_provenance","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-provenance?horse={horse_name}"},{"method":"GET","operation":"horse_rankings","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/rankings?limit={limit}"},{"method":"GET","operation":"horse_signal","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-signal?horse={horse_name}&signal={signal}"},{"method":"GET","operation":"horse_snapshot","price":"$0.02","price_usd":0.02,"url_template":"https://horsetruth.com.au/api/v1/x402/horse-snapshot?horse={horse_name}"},{"method":"GET","operation":"race_field_read","price":"$1.00","price_usd":1.0,"url_template":"https://horsetruth.com.au/api/v1/x402/race-field-read?date={date}&track={track}&race={race}"}]}],"version":"HORSE-TRUTH-MACHINE-START-1.0","x402_live":true},"version":"1.0.3"}