{"uid":"cap_ztPqTTscmRlPY6SqsLm2r","slug":"sybil-reputation-guard-db4b683a","name":"Sybil Reputation Guard","description":"Assess multiple manipulation signals with uncertainty and mandatory abstention","url":"https://phion.systems/v1/paid/trust/sybil-reputation-guard?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_TLqBmnUKw_hSZQQCmPHmO","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":"Assesses multiple manipulation signals to produce a sybil/bot reputation score with uncertainty quantification and mandatory abstention when confidence is insufficient","exampleAgentPrompt":"Before I proceed with this agent's request, can you run a sybil reputation check on it — assess all manipulation signals and let me know if the result is uncertain enough that you'd recommend abstaining rather than trusting it?","exampleUseCases":[{"title":"Screening counterpart before agent payment","prompt":"I'm about to send a payment to this agent but want to make sure it's not a sybil or bot — can you run a reputation guard check on it and tell me whether you're confident enough to proceed, or if you'd recommend abstaining?"},{"title":"Gating access in a multi-agent marketplace","prompt":"Before letting this new agent participant into our marketplace, assess its manipulation signals and reputation — if confidence is low, I want to block it rather than risk a sybil attack on the system."},{"title":"Validating identity before a task handoff","prompt":"I need to hand off a sensitive task to another agent — please run a sybil reputation assessment on it first and only confirm the handoff if the guard doesn't flag uncertainty or recommend abstention."}],"resultDescription":"Returns a structured assessment of multiple manipulation signals, a reputation score for the evaluated entity, an uncertainty estimate indicating confidence in the verdict, and a mandatory abstention flag when the evidence is insufficient to make a reliable determination — allowing the calling agent to decide whether to proceed or hold.","failureModes":["Insufficient signal data may trigger mandatory abstention rather than a score","Ambiguous or sparse behavioral metadata may result in high uncertainty output","Malformed or missing input entities may return a validation error","Novel manipulation tactics not covered by current signal set may evade detection","Rate limits or payment failures may prevent the call from completing"],"whenToPreferThis":"Choose this endpoint when you need a nuanced, uncertainty-aware sybil and manipulation assessment rather than a binary pass/fail — particularly when abstention is a safe and required option (e.g., before payments, task handoffs, or granting access). Prefer it over generic fraud-detection APIs when the subject is an AI agent or autonomous system, and when you need explicit confidence signaling so downstream logic can safely defer action under ambiguity.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T18:40:59.443Z","isFirstParty":false,"canonicalSlug":"sybil-reputation-guard-db4b683a"}