PHION Agent Trust Infrastructure
PHION Systems · https://phion.systems/
https://phion.systems/.well-known/agent.json
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One hundred twenty-three composable inference, search, intelligence, verified-data, enrichment, durable-task, security, trust, compatibility, reputation, commerce, RWA and indexing services for autonomous AI agents
Transport
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Protocol
1.0
Price
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Skills
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Signed JSON AttestationSign integrity, provenance and freshness receipts for agent JSONattestationintegrityreceiptsx402
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Autonomous Payment FirewallEvaluate a payment requirement against an explicit buyer policy and return a signed decisionpaymentspolicyfirewallx402safety
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Atomic Mandate ReservationEnforce cumulative spending limits with atomic reservations and idempotencypaymentsmandatesbudgetsx402
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Preflight URLFree reachability and safety preflightssrfsafetyweb
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Fetch Independent EvidenceRetrieve, normalize, screen, hash and sign evidence from a public URLevidencewebintegrityprompt-injectionx402
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AI Agent Due DiligenceInspect agent endpoints, standards, payments and identity before trusting or purchasingagentsdue-diligencex402erc8004mcpa2a
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Agent Commerce Journey VerificationVerify hash-linked intent, quote, payment and delivery historiescommerceauditjourneyreceiptsx402
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Transaction AssuranceVerify settlement, delivery and deterministic acceptance; emit a signed receipt and dispute packetcommerceassurancedeliveryacceptancedisputesx402
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Transaction RecoveryClassify paid transaction failures and emit signed recovery claims and deterministic remedy planscommercerecoveryrefundsretriesdisputesx402
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Try PHION Service FreePreview any PHION service, inspect its value and receive exact machine-readable upgrade terms without a wallet or paymentfree-previewtry-before-paymentx402discovery
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Agent Spending GatewayNon-custodial local spending mandates with per-call, cumulative, service and expiry limitspaymentsbudgetsdelegationx402non-custodial
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PHION ExecuteExecute any selected PHION service through one budgeted, persistently idempotent call with acceptance checks and a signed completion envelopeexecutionorchestrationpaymentsidempotencyx402
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PHION Universal MarketNormalize capabilities and compare PHION and configured external providers; economic execution remains buyer-funded, authority-bound and disabled until a production adapter is verifiedmarketcapabilitiesprovidersroutingpreflightbuyer-funded
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Tool Output FirewallInspect untrusted tool output before context ingestion or downstream actiontool-outputprompt-injectionmcpx402
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Delegation Scope GuardValidate least-privilege agent delegation scope, destination, budget and expirydelegationauthorizationleast-privilegex402
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Memory Write GuardScreen persistent agent-memory writes for poisoning and missing provenancememorypoisoningprovenancex402
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MCP Manifest FirewallInspect MCP metadata and schemas before installation or trustmcpmanifestsecurityx402
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Tool Call Policy GuardBind proposed tool calls to declared intent and execution policytoolsintentauthorizationx402
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Data Egress PreflightInspect outbound agent data and destination before transmissionegressdatadlpx402
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Schema Normalize & RepairValidate and safely normalize agent payloads before payment without altering payment-critical valuesschemajsoncompatibilityx402
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RWA Asset Due DiligenceIssuer, contract, custody and disclosure assessment with live evidencerwatokenizationevidencex402
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RWA Compliance DecisionDeterministic declared eligibility and transfer-policy assessmentrwatokenizationevidencex402
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RWA NAV & Reserve VerificationIndependent observations for NAV, reserve and collateral claimsrwatokenizationevidencex402
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RWA Transaction AssuranceAsset, payment, delivery and transfer-rule verificationrwatokenizationevidencex402
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RWA Corporate Action MonitorDetect material NAV, income, maturity, redemption and freeze changesrwatokenizationevidencex402
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Sanctions Screening EvidenceTraceable literal screening against observed official US and EU sources; not legal clearancerwatokenizationevidencex402
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Agent Reputation EvidenceEvidence-bounded reputation score with confidence, coverage and explicit limitationsagentsreputationevidencex402
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Counterparty Risk PreflightDeterministic allow, review or deny decision using supplied reputation evidence and transaction limitsagentscounterpartyriskpaymentsx402
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Agent Budget GuardStop autonomous spending before a call exceeds its task, session or period budget.agentssecuritytrustx402
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Idempotency Replay GuardDistinguish a safe retry from conflicting reuse before an agent repeats an action or payment.agentssecuritytrustx402
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Human Approval PolicyMake escalation predictable by classifying actions before execution.agentssecuritytrustx402
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Secret Redaction PreflightRemove common secret indicators before agent context or payload leaves its boundary.agentssecuritytrustx402
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OAuth Token Audience GuardPrevent token forwarding to the wrong resource after local signature validation.agentssecuritytrustx402
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Redirect Callback ValidatorReject unsafe callbacks, ambiguous domains and redirects outside an explicit allowlist.agentssecuritytrustx402
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Tool Capability Drift MonitorDetect when an approved tool changes its schema or declared capabilities.agentssecuritytrustx402
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MCP Server Identity EvidenceBind the declared MCP domain, endpoint, manifest, key and version into portable evidence.agentssecuritytrustx402
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Agent Task Handoff ReceiptGive collaborating agents a portable statement of task, scope, budget and expiry.agentssecuritytrustx402
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Context Provenance LabelerCarry integrity and confidentiality labels with agent context instead of losing its origin.agentssecuritytrustx402
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Signed Result ComparatorExpose exact agreement or conflict between multiple agent results without inventing consensus.agentssecuritytrustx402
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Service SLA AttestationTurn bounded availability and latency samples into auditable signed SLA evidence.agentssecuritytrustx402
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Autonomous Payment FirewallReject unsafe payment terms before an autonomous agent signs or spends.agentsservicesx402
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Independent Web EvidenceIndependently retrieve, normalize, screen and hash a public source.agentsservicesx402
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AI Agent Due DiligenceInspect an agent endpoint before trusting it, delegating work or paying it.agentsservicesx402
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Commerce Journey VerificationVerify that intent, quote, payment and delivery form one untampered history.agentsservicesx402
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Payment Route SelectorReject routes that cannot safely settle, rank the remaining x402 routes by your policy, and return the exact next action before signing.agentsservicesx402
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x402 Quote ComparatorValidate and normalize x402 v2 quotes, preventing false price comparisons across incompatible assets or decimals.agentsservicesx402
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Payment Receipt ReconcilerFind exact disagreement between intended payment and returned receipt.agentsservicesx402
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Duplicate Charge DetectorDetect repeated payment fingerprints without treating equal prices alone as duplicates.agentsservicesx402
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Subscription Spend GuardAuthorize only the next due recurring charge when subscription, merchant, per-charge and period constraints all match.agentsservicesx402
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Webhook VerifierRequire a trusted signature binding payload, request target and a unique nonce, plus freshness and replay protection.agentsservicesx402
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Delivery EvidenceBind a successful delivery to its request and expected content without returning the delivered payload.agentsservicesx402
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Inter-Agent Policy EvaluatorExpose conflicting policy decisions before collaborating agents act.agentsservicesx402
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Concurrency GuardPrevent agents from exceeding fresh, lease-bound concurrent execution capacity.agentsservicesx402
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Resource Cycle GuardStop repeated execution and enforce complete step, token and cost budgets.agentsservicesx402
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Abandoned Tool DetectorRequire multiple independent failure signals before classifying probable abandonment.agentsservicesx402
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Manifest Version DiffShow precisely which top-level manifest fields changed between versions.agentsservicesx402
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Dependency Provenance AssessmentSeparate declared identity and digest from independently verified dependency provenance.agentsservicesx402
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Conflict ResolutionResolve competing results only when source, value hash, time and confidence are bound.agentsservicesx402
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Data Freshness CertificateCertify age only when it is bound to a source and exact content hash.agentsservicesx402
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Domain Ownership EvidenceValidate a fresh domain-bound DNS-01 or HTTP-01 challenge without claiming legal ownership.agentsservicesx402
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Purpose-Bound ConsentBind consent to ID, subject, recipient, purpose, scope, lifetime and checked revocation state.agentsservicesx402
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Retention & Deletion ReceiptCreate a signed receipt for a declared retention or deletion operation.agentsservicesx402
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Interrupted Task RecoveryResume only from a task-bound checkpoint with known side effects and idempotency.agentsservicesx402
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Portable Observability AuditValidate and sign a bounded hash chain with portable W3C trace context.agentsservicesx402
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PHION Index FeedReplace repeated catalog sweeps with one canonical snapshot or digest-based delta ready for PHION Execute.agentsservicesx402
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Verified Web ExtractRetrieve bounded public web content with source identity, observation time and content hashes.agentsservicesx402
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Entity Enrichment EvidenceMeasure entity-field coverage in public sources without fabricating absent facts.agentsservicesx402
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Social Source EvidencePreserve public social-source statements while separating content evidence from identity claims.agentsservicesx402
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Market Data SnapshotCapture public market data as an immutable, timestamped evidence snapshot.agentsservicesx402
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Onchain EvidenceCapture public explorer or RPC responses as tamper-evident evidence.agentsservicesx402
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Verified News MonitorLocate literal topic evidence across bounded public news sources.agentsservicesx402
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Multi-Source Fact BundleBundle independent observations without disguising disagreement as certainty.agentsservicesx402
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Document to Verified JSONNormalize public text, HTML, JSON or XML documents into verifiable JSON; image and PDF OCR excluded.agentsservicesx402
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Source-Backed SearchSearch only supplied public sources and return literal evidence rather than generated claims.agentsservicesx402
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Live Data FreshnessTest live source observations against an explicit maximum-age budget.agentsservicesx402
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Person Enrichment EvidenceResolve a person from strong identifiers and return signed, provider-attributed evidence with explicit limitations.agentsservicesx402
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Company Enrichment EvidenceResolve a company from domain, profile, ticker or name and return signed provider-attributed evidence.agentsservicesx402
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Contact Enrichment EvidenceResolve a business contact from strong identifiers without presenting enrichment as identity proof.agentsservicesx402
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MCP 2026 Compatibility GatewayValidate modern stateless MCP discovery, protocol and method compatibility before connection.agentsservicesx402
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Durable Agent TaskValidate a durable task envelope with expiry, requester isolation and replay-safe identity.agentsservicesx402
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Task Checkpoint EvidenceBind task ID, monotonic sequence and exact state hash in signed evidence.agentsservicesx402
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Task Cancel AssuranceVerify cancellation state and expose every unresolved side effect.agentsservicesx402
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Agent Approval RelayBind an approval or denial to purpose, payload and a strict expiry.agentsservicesx402
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Capability Negotiation PreflightDetect capability mismatch before an agent commits time or payment.agentsservicesx402
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MCP Catalog Cache GuardBind an MCP catalog digest to explicit cache lifetime, scope and revalidation behavior.agentsservicesx402
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OAuth Issuer Binding EvidenceBind already verified OAuth claims to the exact intended issuer and audience without receiving raw tokens.agentsservicesx402
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MCP-A2A Task BridgeMap MCP and A2A task identities while preserving state, authority and expiry.agentsservicesx402
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Quote Freshness GuardReject payment quotes that cannot remain valid through authorization and retry.agentsservicesx402
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Delegated Credential GuardEnforce delegated scope and expiry without sending PHION a raw access token.agentsservicesx402
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Agent Session ContinuityDetect session substitution, skipped sequence and broken hash continuity.agentsservicesx402
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Task Lease GuardPrevent expired or non-owner agents from mutating a leased task.agentsservicesx402
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Tool Result Schema ValidatorReject missing or unexpected top-level fields before another agent consumes a tool result.agentsservicesx402
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Agent Memory ProvenanceBind a memory record to its declared source identity and observation time.agentsservicesx402
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Payment Delivery AtomicityDetect the exact split state between payment and delivery and require recovery when necessary.agentsservicesx402
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Service Failover SelectorSelect only a healthy compatible provider using explicit priority; never fail over silently.agentsservicesx402
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Agent Rate Limit NegotiatorNegotiate deterministic sustained and burst limits before an agent starts a workload.agentsservicesx402
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Execution Cost EstimatorCompute a fail-closed maximum cost before a multi-step agent plan executes.agentsservicesx402
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Cross-Agent Receipt BundleBundle unique agent-bound result receipts without disguising declarations as external truth.agentsservicesx402
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Capability VerificationSeparate claimed capabilities from independently evidenced successful demonstrations.agentsservicesx402
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Capability BenchmarkMeasure reproducible success, latency and cost from versioned evidence-bound benchmark cases.agentsservicesx402
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Sybil Reputation GuardCombine multiple bounded Sybil signals while abstaining without independent evidence.agentsservicesx402
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Agent Behavior FingerprintCreate a privacy-minimized behavioral commitment without retaining payloads or raw identifiers.agentsservicesx402
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Trust Anomaly DetectorDetect material drift between comparable trust vectors without asserting misconduct.agentsservicesx402
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Economic Loop DetectorDetect self-transfer and reciprocal economic patterns without presenting correlation as fraud.agentsservicesx402
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Provider Quality PredictorEstimate provider success, quality, latency and cost using transparent sample-aware statistics.agentsservicesx402
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Transaction Risk ScoreEstimate evidence-supported loss probability without selling insurance or assuming liability.agentsservicesx402
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Payment OptimizerRank only integration-tested payment routes under explicit cost and latency constraints.agentsservicesx402
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x402 v2 RouterSelect an exactly compatible x402 v2 payment requirement without receiving private keys.agentsservicesx402
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ERC-8004 Identity EvidenceBind an ERC-8004 registry identity to evidence while separating registration from ownership.agentsservicesx402
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ERC-8004 Reputation IntelligenceAggregate diverse verified reputation observations with low-sample abstention.agentsservicesx402
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Delegated Spend PolicyFail closed when delegated authority, per-call limit or remaining budget is insufficient.agentsservicesx402
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AP2 Mandate BridgeMap mandate fields for review without advertising unsupported AP2 production authorization.agentsservicesx402
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A2A Transaction BridgeBind an A2A task to a transaction without silently transferring authority.agentsservicesx402
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MCP Transaction GatewayBind an MCP tool call to transaction evidence without granting undeclared authority.agentsservicesx402
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Proof of ServiceCommit request, authority, execution, payment and delivery evidence in one proof.agentsservicesx402
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Automated Dispute BundleAssemble failure evidence and recommend resolution without executing refunds.agentsservicesx402
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Transaction Recovery v2Recommend bounded recovery and reconcile ambiguous payments before retry.agentsservicesx402
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Reputation Update ReceiptRecommend a bounded auditable reputation update from verified outcome evidence.agentsservicesx402
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Agent Economic GraphBuild privacy-bounded economic relationships only from supplied nodes and edges.agentsservicesx402
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Market Demand PredictorForecast verified demand trends while abstaining on insufficient history.agentsservicesx402
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Service Gap DetectorDetect capability shortages using verified demand and verified provider supply.agentsservicesx402
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Price Discovery EngineDerive price bands only from settled observations, never traffic or unsigned quotes.agentsservicesx402
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SLA Risk PredictorEstimate SLA failure probability from bounded success and latency evidence.agentsservicesx402
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Dynamic Service PricingPropose a capped shadow price without changing the live catalog.agentsservicesx402
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Autonomous ProcurementRecommend a verified eligible provider under a mandate without purchasing.agentsservicesx402
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Multi-Agent EscrowRecommend hold or release from evidence without PHION custody or fund movement.agentsservicesx402
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Cross-Protocol ReceiptBundle consistent transaction commitments across multiple protocols.agentsservicesx402
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PHION InferenceComplete a bounded inference microtask and return a directly usable answer with signed delivery.agentsservicesx402
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PHION SearchSearch the live web and return normalized source URLs and snippets with signed delivery.agentsservicesx402
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PHION Basic Domain EnrichmentObserve a public company domain directly and return bounded website metadata, hashes, injection screening and signed delivery without an expensive enrichment upstream.agentsservicesx402
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PHION EnrichEnrich a company, person or contact through an attributed provider route without hiding upstream cost.agentsservicesx402
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PHION IntelligenceSearch, synthesize and cite evidence in one call, minimizing residual agent work.agentsservicesx402
How to call
A2A endpoint (JSONRPC)
https://phion.systems/
Agent card
https://phion.systems/.well-known/agent.json
Documentation
https://phion.systems/services
Homepage
https://phion.systems/
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Directories this entry was found in.
a2aregistry