{"id":526177,"name":"x402check","description":"Call before paying any x402 tool. Trust-check the seller URL: is it reachable, is the 402 legit, what payTo/price does it demand, and has payTo or price drifted. Returns ok|caution|avoid + that tool's history only. Budget guard and compare helpers for agents. Paid per URL. Not a wallet OFAC/drainer scanner.","card_url":"https://x402check.dev/.well-known/agent-card.json","endpoint":"https://x402check.dev/preflight","protocol_version":"0.3.0","first_seen":"2026-11-01T21:38:15.913837+00:00","last_verified":"2026-11-01T21:38:15.913837+00:00","card":{"url":"https://x402check.dev/preflight","name":"x402check","skills":[{"id":"preflight_one","name":"Preflight one x402 tool","tags":["x402","trust","preflight","safety","payTo","verify","uptime","scam-check","budget-guard"],"examples":["GET https://x402check.dev/preflight?url=https://seller.example/api (pay $0.002 first)","Is https://seller.example/x402 safe to pay?","Verify payTo for this x402 tool before settle","Has this seller changed price or wallet?","Is this x402 endpoint down?"],"inputModes":["application/json"],"description":"Trust-check one absolute https x402 seller URL before you pay it. Use for: is this endpoint safe/legit; verify payTo; detect price or wallet drift; check uptime; validate 402 payment requirements; budget guard before signing USDC on Base; debug a failing 402.","outputModes":["application/json"]},{"id":"verify_payto","name":"Verify x402 payTo","tags":["x402","payTo","verify","wallet","Base","USDC"],"examples":["What payTo address does this x402 tool demand?","Compare payTo to my allowlist before settle"],"inputModes":["application/json"],"description":"Extract and verify the receiving wallet (payTo) from a seller's live 402 challenge, with history of wallet rotations. Use before signing a USDC transfer.","outputModes":["application/json"]},{"id":"preflight_batch","name":"Compare / batch preflight x402 tools","tags":["x402","trust","batch","compare","cheapest","reliable"],"examples":["POST https://x402check.dev/preflight {\"urls\":[\"https://a.example\",\"https://b.example\"]}","Which of these paid APIs is safest and cheapest?"],"inputModes":["application/json"],"description":"Trust-check up to 25 seller URLs in one request. Charged per URL (N × unit) in a single Exact settlement. Use when comparing candidates, picking cheapest/most reliable, or screening Bazaar hits before paying.","outputModes":["application/json"]}],"iconUrl":"https://x402check.dev/assets/icon.svg","version":"0.2.2","provider":{"url":"https://x402check.dev","organization":"x402check"},"security":[{"x402":[]}],"description":"Call before paying any x402 tool. Trust-check the seller URL: is it reachable, is the 402 legit, what payTo/price does it demand, and has payTo or price drifted. Returns ok|caution|avoid + that tool's history only. Budget guard and compare helpers for agents. Paid per URL. Not a wallet OFAC/drainer scanner.","capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"protocolVersion":"0.3.0","securitySchemes":{"x402":{"in":"header","name":"PAYMENT-SIGNATURE","type":"apiKey","description":"x402 Exact payment proof after 402 PAYMENT-REQUIRED challenge"}},"documentationUrl":"https://x402check.dev/docs","defaultInputModes":["application/json","text/plain"],"defaultOutputModes":["application/json"],"preferredTransport":"HTTP+JSON","supportedInterfaces":[{"url":"https://x402check.dev/preflight","protocolBinding":"https://x402.org/http+json","protocolVersion":"2"},{"url":"https://x402check.dev/mcp","protocolBinding":"https://modelcontextprotocol.io/streamable-http","protocolVersion":"2025-03-26"}]},"status":"verified","publisher_domain":"x402check.dev","signature_status":"unsigned","signature_detail":"No card signature supplied","signature_key_url":null,"signature_checked_at":"2026-11-01T21:38:15.913837+00:00","domain_claimed_at":null,"domain_proof_checked_at":null,"source_name":"Publisher Agent Card","source_url":"https://x402check.dev/.well-known/agent-card.json","last_check":{"checked_at":"2026-11-01T21:38:15.913837+00:00","success":true,"http_status":200,"detail":"Agent Card validated"},"also_published_at":[],"history_urls":["https://x402check.dev/.well-known/agent-card.json"],"skills":[{"skill_id":"preflight_batch","name":"Compare / batch preflight x402 tools","description":"Trust-check up to 25 seller URLs in one request. Charged per URL (N × unit) in a single Exact settlement. Use when comparing candidates, picking cheapest/most reliable, or screening Bazaar hits before paying.","tags":["x402","trust","batch","compare","cheapest","reliable"],"quality_warning":false},{"skill_id":"preflight_one","name":"Preflight one x402 tool","description":"Trust-check one absolute https x402 seller URL before you pay it. Use for: is this endpoint safe/legit; verify payTo; detect price or wallet drift; check uptime; validate 402 payment requirements; budget guard before signing USDC on Base; debug a failing 402.","tags":["x402","trust","preflight","safety","payTo","verify","uptime","scam-check","budget-guard"],"quality_warning":false},{"skill_id":"verify_payto","name":"Verify x402 payTo","description":"Extract and verify the receiving wallet (payTo) from a seller's live 402 challenge, with history of wallet rotations. Use before signing a USDC transfer.","tags":["x402","payTo","verify","wallet","Base","USDC"],"quality_warning":false}],"quality_flags":[],"check_history":{"checks":1,"passed":1},"recent_checks":[{"card_url":"https://x402check.dev/.well-known/agent-card.json","checked_at":"2026-11-01T21:38:15.913837+00:00","success":true,"http_status":200,"detail":"Agent Card validated"}],"endpoint_tls_check":{"checked_at":"2026-11-01T21:38:15.913837+00:00","success":true,"detail":"Valid TLS connection to advertised endpoint host; no A2A request sent"},"protocol_check":{"checked_at":"2026-11-01T21:38:15.913837+00:00","endpoint":"https://x402check.dev/preflight","protocol_binding":"HTTP+JSON","protocol_version":"0.3.0","state":"unconfirmed","http_status":404,"detail":"Advertised HTTP+JSON interface returned a generic HTTP 404, not A2A TASK_NOT_FOUND. Publish the A2A service base URL with its standard task route; an ordinary REST resource URL does not establish A2A support","request_diagnostics":{"requests":[{"path":"/preflight/v1/tasks/localmark-probe-0b33f89f-ae09-403e-b71c-9dceb4b52b74","allow":[],"method":"GET","status":404,"version_header":"0.3","protocol_method":null,"redirect_followed":false}],"capture_version":1}},"declared_primary_endpoint":"https://x402check.dev/preflight","selected_connection_interface":{"url":"https://x402check.dev/preflight","protocolBinding":"HTTP+JSON","protocolVersion":"0.3.0"},"protocol_interface_checks":[{"endpoint":"https://x402check.dev/preflight","protocol_binding":"HTTP+JSON","protocol_version":"0.3.0","selected":true,"state":"unconfirmed","checked_at":"2026-11-01T21:38:15.913837+00:00","http_status":404,"detail":"Advertised HTTP+JSON interface returned a generic HTTP 404, not A2A TASK_NOT_FOUND. Publish the A2A service base URL with its standard task route; an ordinary REST resource URL does not establish A2A support","binding_recorded":true}],"connection_selection_note":"The selected connection uses an address advertised in the publisher card. Read-only observations do not establish task quality or safety.","x402_price_check":null,"events":[],"relationships":[],"verification":{"agent_card_url":"https://x402check.dev/.well-known/agent-card.json","last_successful_card_check":"2026-11-01T21:38:15.913837+00:00","latest_card_check":{"checked_at":"2026-11-01T21:38:15.913837+00:00","success":true,"http_status":200,"detail":"Agent Card validated"},"signature_status":"unsigned","signature_checked_at":"2026-11-01T21:38:15.913837+00:00","task_endpoint_tested":true,"task_execution_tested":false,"endpoint_tls_checked_at":"2026-11-01T21:38:15.913837+00:00","endpoint_tls_reachable":true,"protocol_check_state":"unconfirmed","protocol_checked_at":"2026-11-01T21:38:15.913837+00:00","provider_identity_verified":false,"domain_claimed_at":null,"domain_proof_checked_at":null},"synthetic_capability_tests":{"agent_id":526177,"status":"not_tested","reason_code":"not_yet_tested","consent_status":"not_confirmed","latest_observation_status":null,"last_checked_at":null,"fixture_version":"1","reference_demonstration":false,"scope":"A publisher-authorized synthetic test of a dedicated free test endpoint. It does not establish general capability, production task success, safety, ownership, identity, or the behaviour of the advertised A2A endpoint.","methodology_url":"https://localmark.ai/capability-tests","history":[]},"repair_links":{"agent_repair_url":"https://localmark.ai/agents/526177/repair","publisher_report_url":"https://localmark.ai/publishers/x402check.dev/repair","diagnostics_json_url":"https://localmark.ai/publishers/x402check.dev/repair/diagnostics.json","diagnostics_csv_url":"https://localmark.ai/publishers/x402check.dev/repair/diagnostics.csv"},"_localmark":{"contribution":{"optional":true,"directory_access":"free","operator_authorization_required":true,"affects_rankings":false,"message":"LocalMark is free. Optional contributions help fund ongoing checks.","support_url":"https://localmark.ai/support","metadata_url":"https://localmark.ai/api/v1/support/contributions"}}}