{"uid":"cap_3mdvUl_5yG7CcrVZGtD6E","slug":"mcp-transaction-gateway-6d3667b6","name":"MCP Transaction Gateway","description":"Bind MCP tool-call identity to a transaction without silently granting authority","url":"https://phion.systems/v1/paid/trust/mcp-transaction-gateway?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["body"],"properties":{"body":{"type":"object","additionalProperties":true}}},"output":{"type":"object","required":["example"],"properties":{"example":{"type":"object","additionalProperties":true}}}}},"responseSchema":{"type":"json"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_O8YikS2zmvOJqo4cpqOZI","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Binds an MCP tool-call identity to a payment transaction without silently granting spending authority","exampleAgentPrompt":"Before allowing this MCP tool call to proceed with payment, bind the tool-call identity to the transaction so spending authority isn't silently granted — I need an explicit authorization receipt tying this specific invocation to the transaction.","exampleUseCases":[{"title":"Least-privilege payment gate for MCP agent","prompt":"I need to make sure that when my MCP agent calls a paid tool, it doesn't silently inherit spending authority — can you bind the tool-call identity to this transaction explicitly so I get a receipt proving who authorized the payment?"},{"title":"Audit trail for agentic commerce","prompt":"My multi-agent pipeline is initiating a transaction and I need a verifiable record showing exactly which MCP tool call triggered it without granting that tool any broader authority — bind the identity and give me an attestation I can audit later."},{"title":"Preventing unauthorized spend escalation","prompt":"Before this MCP tool call is allowed to move funds, I want to explicitly authorize just this transaction — not open up any ongoing spending authority — so bind the tool-call identity to the payment now and confirm nothing beyond this single transaction is granted."}],"resultDescription":"A signed receipt or attestation confirming that the specified MCP tool-call identity has been explicitly bound to the transaction, with no implicit or ongoing spending authority granted beyond the declared scope.","failureModes":["Missing or malformed MCP tool-call identity results in a 400 error and rejection","Transaction reference not found or already bound returns a conflict error","Attempt to bind with mismatched identity/transaction scope is rejected to prevent authority escalation","Malformed request body (empty schema) may cause validation errors if required fields are absent","Network or upstream service errors return 5xx with no binding issued"],"whenToPreferThis":"Use this endpoint when an MCP-based agent needs to initiate or participate in a payment transaction and you require explicit, auditable identity binding to that transaction — specifically to prevent the agent from silently inheriting spending authority. Prefer this over generic payment authorization when the caller is an MCP tool and least-privilege enforcement plus provenance attestation are required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T01:39:50.646Z","isFirstParty":false,"canonicalSlug":"mcp-transaction-gateway-6d3667b6"}