{"data":{"slug":"karp-agents-api","name":"KARP Agents API","description":"Hallucination check and research for AI agents. POST /v1/check fact-checks one claim live with four independent web-searching models (GPT, Gemini, Grok, Claude): verdict, agreement such as 4/4, confidence and sources, $0.25. POST /v1/ask returns dated research cards from KARP's multi-model research library, $0.03. Free POST /v1/coverage shows what's covered. 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Each card gives the conclusion, key insight, warnings, dated figures, consensus status, open questions, research date and staleness. See what is covered first with the free POST /v1/coverage; verify time-sensitive points with POST /v1/check. Catalogue: GET /. ~15 s.","mime_type":"application/json","is_active":true,"first_seen_at":"2026-10-27T11:32:07.698Z","last_seen_at":"2026-10-27T14:29:12.182Z","variable_amount":false,"min_price_usd":0.03,"networks":["BSE","SOL"],"pricing":[{"scheme":"exact","network":"eip155:8453","network_caip2":"eip155:8453","asset_address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","asset_address_norm":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","asset_name":"USDC","price":"30000","price_usd":"0.0300000000","pay_to":"0xd4f35A0279Fa09562B656dB1577Cdce5FDB00f3E","max_timeout_seconds":180},{"scheme":"exact","network":"solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp","network_caip2":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","asset_address":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","asset_address_norm":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","asset_name":"USDC","price":"30000","price_usd":"0.0300000000","pay_to":"39Z4E5XdnTHWGbLUpNqTBQ1H9uEJdvhMvEEPn49S3m6u","max_timeout_seconds":180}],"pay_to_divergence":null},{"id":"9eca16ff-2f4d-44fb-83b7-d0efdee38995","method":"POST","path":"/v1/check","description":"Hallucination check: a live fact-check of one claim by four independent AI models (GPT, Gemini, Grok, Claude), each searching the web separately. Returns a summary first: verdict (confirmed, disputed, unverifiable, or contested when the models split), agreement such as 4/4, mean confidence and a one-line headline. Then each model's verdict, reasoning and cited sources. Disagreement is shown, not hidden. 10-45 s.","mime_type":"application/json","is_active":true,"first_seen_at":"2026-10-27T11:32:07.698Z","last_seen_at":"2026-10-27T14:29:12.172Z","variable_amount":false,"min_price_usd":0.25,"networks":["BSE","SOL"],"pricing":[{"scheme":"exact","network":"eip155:8453","network_caip2":"eip155:8453","asset_address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","asset_address_norm":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","asset_name":"USDC","price":"250000","price_usd":"0.2500000000","pay_to":"0xd4f35A0279Fa09562B656dB1577Cdce5FDB00f3E","max_timeout_seconds":180},{"scheme":"exact","network":"solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp","network_caip2":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","asset_address":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","asset_address_norm":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","asset_name":"USDC","price":"250000","price_usd":"0.2500000000","pay_to":"39Z4E5XdnTHWGbLUpNqTBQ1H9uEJdvhMvEEPn49S3m6u","max_timeout_seconds":180}],"pay_to_divergence":null}],"pay_to_changes":[],"assessment":{"updated_at":"2026-10-27T11:34:00.825Z","input_hash":"607afb1290ede4f92ceb996a272eedf01d8cc0c17e9e24351adc53a19a5c543a","model_id":null,"prompt_version":null,"reliability":{"uptime":{"24h":null,"7d":null,"30d":null,"90d":null},"response_p95_ms":1470,"avg_response_ms":1470,"last_checked_at":"2026-10-27T11:33:03.119Z","consecutive_failures":-1,"total_checks":1},"compliance":{"grade":"A","passed":14,"total":14,"checks":[{"id":"payload_captured","label":"402 payload captured","pass":true},{"id":"accepts_present","label":"accepts[] array present","pass":true},{"id":"payto_recoverable","label":"payTo address recoverable","pass":true},{"id":"payto_conformant","label":"payTo at accepts[0].payTo (conformant shape)","pass":true},{"id":"payto_shape","label":"payTo is a valid on-chain address","pass":true},{"id":"price_present","label":"atomic price declared","pass":true},{"id":"price_sane","label":"atomic price in a sane range","pass":true},{"id":"asset_declared","label":"asset (token) address declared","pass":true},{"id":"network_caip2","label":"network resolves to CAIP-2","pass":true},{"id":"scheme_declared","label":"payment scheme declared","pass":true},{"id":"transport_https","label":"served over HTTPS","pass":true},{"id":"x402_version_current","label":"declares the current x402 version (2)","pass":true},{"id":"eip712_domain_extra","label":"EIP-712 domain parameters present on every EVM entry","pass":true},{"id":"version_channel_coherent","label":"x402 v2 envelope delivered in the payment-required header","pass":true}],"pay_to_source":"payTo","pay_to_location":"accept","staleness":{"probe_failing":false,"last_success_at":"2026-10-27T14:29:12.226Z","envelope_captured_at":"2026-10-27T11:33:03.119Z"}},"site":{"homepage":true,"openapi":true,"pricing":false,"llms_txt":true,"robots":true,"terms":false,"checked_at":"2026-10-27T11:33:56.957Z"},"domain":{"age_days":null,"registrar":null,"free_host":false,"created_date":null,"checked_at":"2026-10-27T11:34:00.731Z"},"economics":{"price_usd":0.03,"price_atomic":"30000","model":"tiered","category_percentile":75,"stability":1,"price_max_usd":0.25,"category_percentile_max":73,"endpoint_count":2,"distinct_price_count":2},"risk":{"level":"clean","flags":[]},"synthesis":null,"traction":{"status":"measured","volume_usd_30d":0,"tx_count_30d":0,"unique_buyers_30d":0,"last_settlement_at":null,"top_buyer_share_30d":null,"top_3_buyers_share_30d":null,"concentrated_volume":false,"trend_7d_vs_30d":null,"shared_payout":false,"shared_with":0,"measured_networks":["eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d"],"first_settlement_at":null,"volume_usd_all_time":0,"tx_count_all_time":0,"median_settlement_usd_30d":null,"max_settlement_usd_30d":null,"settled_via":[],"settled_via_detail":[],"shared_with_services":[],"pro_quota_share":1,"caveat":"Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.","all_time_caveat":"All-time is floored at the start of our harvest window, not the service full history."}}},"provenance":{"license":"CC-BY-4.0","attribution_required":true,"attribution":"Data: x402-list.com (CC BY 4.0)","cite_as":"https://x402-list.com/services/karp-agents-api","source":"https://x402-list.com"}}