{ "x402Version": 2, "id": 35266, "slug": "35266", "resource": "https://agent-economy.kgninja.dev/verify-evidence", "description": "Deterministic JSON evidence checks with signed verification evidence", "type": "http", "serviceName": "Agent Verification Utility", "resourceType": "MCP Tool", "accepts": [ { "scheme": "exact", "network": "eip155:8453", "payTo": "0x4D7d842536De9Eb491AE2300126B3CDdE7B0aDE3", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "amount": "10000", "amountUsd": 0.01, "maxTimeoutSeconds": 300 } ], "outputSchema": { "properties": { "example": { "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" }, "extensions": { "bazaar": { "info": { "input": { "body": { "precheck_receipt_digest": "sha256:46dcfeb9495af1fd591447414866007f0915b8f5fdc20137091e4f4dabd80140", "request": { "assertions": [ { "expected": "USD", "op": "json_pointer_equals", "path": "/invoice/currency" } ], "client_request_id": "agent-example-001", "evidence": { "content_base64": "eyJpbnZvaWNlIjp7ImN1cnJlbmN5IjoiVVNEIiwidG90YWwiOjEyNTB9fQ==", "media_type": "application/json" } }, "spend_policy": { "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "max_amount_atomic": "10000", "network": "eip155:8453", "pay_to": "0x4D7d842536De9Eb491AE2300126B3CDdE7B0aDE3", "policy_version": "agent-economy/precheck-policy/2.0" } }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "evidence": { "evidence_id": "evd_example", "signature": { "alg": "Ed25519", "kid": "https://agent-economy.kgninja.dev/agent.json#evidence-key-1", "value_b64url": "ZXhhbXBsZQ" }, "signed_payload_b64url": "ZXhhbXBsZQ" }, "quote_id": "qte_example", "receipt": { "contribution_margin_lower_bound_microusd": 8766, "cost_basis": "conservative_upper_bound", "delivery": "completed", "paid_verification_binding": { "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "binding_digest": "sha256:ba1748b1d09b6425af27aef50ab4dfc485c4126f59747075f8e94320ef42b12e", "discovery_survived": true, "evidence_digest": "sha256:f0dba6a8aba27d498fd40732f4f804160f2d82aa4247fd2335ef8f33b751dbfb", "expires_at": "2026-08-08T00:05:00.000Z", "network": "eip155:8453", "paid_receipt_id": "rcpt_example", "pay_to": "0x4D7d842536De9Eb491AE2300126B3CDdE7B0aDE3", "policy_version": "agent-economy/precheck-policy/2.0", "precheck_receipt_digest": "sha256:46dcfeb9495af1fd591447414866007f0915b8f5fdc20137091e4f4dabd80140", "price_cap_atomic": "10000", "quote_id": "qte_example", "quoted_amount_atomic": "10000", "refusal_reason": null, "request_hash": "sha256:f9762330c1c9fadc8f7126e01e3b823c50297329de5736d6c7408a5984c1cf5e", "schema_version": "agent-economy/paid-verification-binding/1.0", "state": "delivered" }, "price_paid_microusd": 10000, "receipt_id": "rcpt_example", "variable_cost_upper_bound_microusd": 1234 }, "request_hash": "sha256:f9762330c1c9fadc8f7126e01e3b823c50297329de5736d6c7408a5984c1cf5e", "transaction_id": "txn_example", "verification": { "algorithm_version": "det-json-v1", "checks": [ { "index": 0, "op": "json_pointer_equals", "passed": true } ], "executed_at": "2026-08-08T00:00:00.000Z", "outcome": "pass" } }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "additionalProperties": false, "properties": { "precheck_receipt_digest": { "pattern": "^sha256:[a-f0-9]{64}$", "type": "string" }, "request": { "additionalProperties": false, "properties": { "assertions": { "items": { "oneOf": [ { "additionalProperties": false, "properties": { "expected_hex": { "pattern": "^[a-f0-9]{64}$", "type": "string" }, "op": { "const": "sha256_equals", "type": "string" } }, "required": [ "op", "expected_hex" ], "type": "object" }, { "additionalProperties": false, "properties": { "op": { "const": "json_pointer_exists", "type": "string" }, "path": { "maxLength": 512, "type": "string" } }, "required": [ "op", "path" ], "type": "object" }, { "additionalProperties": false, "properties": { "expected": {}, "op": { "const": "json_pointer_equals", "type": "string" }, "path": { "maxLength": 512, "type": "string" } }, "required": [ "op", "path", "expected" ], "type": "object" }, { "additionalProperties": false, "properties": { "expected_type": { "enum": [ "null", "boolean", "number", "string", "array", "object" ], "type": "string" }, "op": { "const": "json_type_is", "type": "string" }, "path": { "maxLength": 512, "type": "string" } }, "required": [ "op", "path", "expected_type" ], "type": "object" } ] }, "maxItems": 16, "minItems": 1, "type": "array" }, "client_request_id": { "maxLength": 64, "minLength": 1, "pattern": "^[A-Za-z0-9._:-]+$", "type": "string" }, "evidence": { "additionalProperties": false, "properties": { "content_base64": { "contentEncoding": "base64", "contentMediaType": "application/json", "maxLength": 87384, "type": "string" }, "media_type": { "const": "application/json", "type": "string" } }, "required": [ "media_type", "content_base64" ], "type": "object" } }, "required": [ "client_request_id", "evidence", "assertions" ], "type": "object" }, "spend_policy": { "additionalProperties": false, "properties": { "asset": { "pattern": "^0x[a-fA-F0-9]{40}$", "type": "string" }, "max_amount_atomic": { "maxLength": 16, "pattern": "^[1-9][0-9]*$", "type": "string" }, "network": { "enum": [ "eip155:84532", "eip155:8453" ], "type": "string" }, "pay_to": { "pattern": "^0x[a-fA-F0-9]{40}$", "type": "string" }, "policy_version": { "const": "agent-economy/precheck-policy/2.0", "type": "string" } }, "required": [ "policy_version", "max_amount_atomic", "network", "asset", "pay_to" ], "type": "object" } }, "required": [ "request", "spend_policy", "precheck_receipt_digest" ], "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST", "PUT", "PATCH" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } }, "example_usage": { "instruction": "Synthetic illustration only. Before purchase, POST your actual request and spend_policy to /validate-request, use its precheck_receipt.receipt_digest, and preserve both unchanged. Re-run precheck after any change. Output signatures and IDs are illustrative, not proof of payment.", "payment_authorized": false, "synthetic": true }, "payment-identifier": { "info": { "required": false }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "id": { "maxLength": 128, "minLength": 16, "pattern": "^[a-zA-Z0-9_-]+$", "type": "string" }, "required": { "type": "boolean" } }, "required": [ "required" ], "type": "object" } } }, "tags": [ "verification", "json", "signed-evidence", "mcp", "agents", "bazaar", "example_usage", "payment-identifier" ], "sourceHost": "agent-economy.kgninja.dev", "lastUpdated": "2026-10-12T06:40:07.635Z", "quality": { "calls30d": 2, "uniquePayers30d": 2, "lastCalledAt": "2026-10-12T06:40:05.406Z" }, "metadata": { "serviceName": "Agent Verification Utility", "extensions": { "bazaar": { "info": { "input": { "body": { "precheck_receipt_digest": "sha256:46dcfeb9495af1fd591447414866007f0915b8f5fdc20137091e4f4dabd80140", "request": { "assertions": [ { "expected": "USD", "op": "json_pointer_equals", "path": "/invoice/currency" } ], "client_request_id": "agent-example-001", "evidence": { "content_base64": "eyJpbnZvaWNlIjp7ImN1cnJlbmN5IjoiVVNEIiwidG90YWwiOjEyNTB9fQ==", "media_type": "application/json" } }, "spend_policy": { "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "max_amount_atomic": "10000", "network": "eip155:8453", "pay_to": "0x4D7d842536De9Eb491AE2300126B3CDdE7B0aDE3", "policy_version": "agent-economy/precheck-policy/2.0" } }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "evidence": { "evidence_id": "evd_example", "signature": { "alg": "Ed25519", "kid": "https://agent-economy.kgninja.dev/agent.json#evidence-key-1", "value_b64url": "ZXhhbXBsZQ" }, "signed_payload_b64url": "ZXhhbXBsZQ" }, "quote_id": "qte_example", "receipt": { "contribution_margin_lower_bound_microusd": 8766, "cost_basis": "conservative_upper_bound", "delivery": "completed", "paid_verification_binding": { "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "binding_digest": "sha256:ba1748b1d09b6425af27aef50ab4dfc485c4126f59747075f8e94320ef42b12e", "discovery_survived": true, "evidence_digest": "sha256:f0dba6a8aba27d498fd40732f4f804160f2d82aa4247fd2335ef8f33b751dbfb", "expires_at": "2026-08-08T00:05:00.000Z", "network": "eip155:8453", "paid_receipt_id": "rcpt_example", "pay_to": "0x4D7d842536De9Eb491AE2300126B3CDdE7B0aDE3", "policy_version": "agent-economy/precheck-policy/2.0", "precheck_receipt_digest": "sha256:46dcfeb9495af1fd591447414866007f0915b8f5fdc20137091e4f4dabd80140", "price_cap_atomic": "10000", "quote_id": "qte_example", "quoted_amount_atomic": "10000", "refusal_reason": null, "request_hash": "sha256:f9762330c1c9fadc8f7126e01e3b823c50297329de5736d6c7408a5984c1cf5e", "schema_version": "agent-economy/paid-verification-binding/1.0", "state": "delivered" }, "price_paid_microusd": 10000, "receipt_id": "rcpt_example", "variable_cost_upper_bound_microusd": 1234 }, "request_hash": "sha256:f9762330c1c9fadc8f7126e01e3b823c50297329de5736d6c7408a5984c1cf5e", "transaction_id": "txn_example", "verification": { "algorithm_version": "det-json-v1", "checks": [ { "index": 0, "op": "json_pointer_equals", "passed": true } ], "executed_at": "2026-08-08T00:00:00.000Z", "outcome": "pass" } }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "additionalProperties": false, "properties": { "precheck_receipt_digest": { "pattern": "^sha256:[a-f0-9]{64}$", "type": "string" }, "request": { "additionalProperties": false, "properties": { "assertions": { "items": { "oneOf": [ { "additionalProperties": false, "properties": { "expected_hex": { "pattern": "^[a-f0-9]{64}$", "type": "string" }, "op": { "const": "sha256_equals", "type": "string" } }, "required": [ "op", "expected_hex" ], "type": "object" }, { "additionalProperties": false, "properties": { "op": { "const": "json_pointer_exists", "type": "string" }, "path": { "maxLength": 512, "type": "string" } }, "required": [ "op", "path" ], "type": "object" }, { "additionalProperties": false, "properties": { "expected": {}, "op": { "const": "json_pointer_equals", "type": "string" }, "path": { "maxLength": 512, "type": "string" } }, "required": [ "op", "path", "expected" ], "type": "object" }, { "additionalProperties": false, "properties": { "expected_type": { "enum": [ "null", "boolean", "number", "string", "array", "object" ], "type": "string" }, "op": { "const": "json_type_is", "type": "string" }, "path": { "maxLength": 512, "type": "string" } }, "required": [ "op", "path", "expected_type" ], "type": "object" } ] }, "maxItems": 16, "minItems": 1, "type": "array" }, "client_request_id": { "maxLength": 64, "minLength": 1, "pattern": "^[A-Za-z0-9._:-]+$", "type": "string" }, "evidence": { "additionalProperties": false, "properties": { "content_base64": { "contentEncoding": "base64", "contentMediaType": "application/json", "maxLength": 87384, "type": "string" }, "media_type": { "const": "application/json", "type": "string" } }, "required": [ "media_type", "content_base64" ], "type": "object" } }, "required": [ "client_request_id", "evidence", "assertions" ], "type": "object" }, "spend_policy": { "additionalProperties": false, "properties": { "asset": { "pattern": "^0x[a-fA-F0-9]{40}$", "type": "string" }, "max_amount_atomic": { "maxLength": 16, "pattern": "^[1-9][0-9]*$", "type": "string" }, "network": { "enum": [ "eip155:84532", "eip155:8453" ], "type": "string" }, "pay_to": { "pattern": "^0x[a-fA-F0-9]{40}$", "type": "string" }, "policy_version": { "const": "agent-economy/precheck-policy/2.0", "type": "string" } }, "required": [ "policy_version", "max_amount_atomic", "network", "asset", "pay_to" ], "type": "object" } }, "required": [ "request", "spend_policy", "precheck_receipt_digest" ], "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST", "PUT", "PATCH" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } }, "example_usage": { "instruction": "Synthetic illustration only. Before purchase, POST your actual request and spend_policy to /validate-request, use its precheck_receipt.receipt_digest, and preserve both unchanged. Re-run precheck after any change. Output signatures and IDs are illustrative, not proof of payment.", "payment_authorized": false, "synthetic": true }, "payment-identifier": { "info": { "required": false }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "id": { "maxLength": 128, "minLength": 16, "pattern": "^[a-zA-Z0-9_-]+$", "type": "string" }, "required": { "type": "boolean" } }, "required": [ "required" ], "type": "object" } } } }, "liveness": { "reliability": null }, "verified": false, "featured": false, "provider": { "host": "agent-economy.kgninja.dev", "manifest_name": "agent-economy.kgninja.dev", "source": "cdp-mirror", "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources", "submitted_at": "2026-10-13T15:56:53.641Z" }, "exampleResponse": { "example": {}, "type": "string" } }