{"id":"09fa7c3d-c74f-4f28-894a-b1b824723996","shortId":"ay8SDj","kind":"x402","title":"ERC-8004 agent trust scores, search, metadata, and identity lookups via x402 micropayments on Base.","tagline":"ERC-8004 agent trust scores, search, metadata, and identity lookups via x402 micropayments on Base.","description":"The ERC-8004 Trust API (\"The Oracle\") by 8k4protocol is a read-only API that provides trust scores, metadata, search, and identity resolution for on-chain AI agents registered under the ERC-8004 standard. It supports agents across BSC, Base, and Ethereum chains. The `/metrics` endpoint specifically returns platform-level metrics and is gated behind an x402 payment of $0.01 per call, settled on Base (eip155:8453) via the Coinbase x402 facilitator.\n\nThe broader API surface includes numerous paid and free endpoints. Paid endpoints (each $0.001 unless noted) include agent trust score lookups (`/agents/{agent_id}/score`), score explanations with positives/cautions (`/agents/{agent_id}/score/explain`), agent validation histories, semantic agent search (`/agents/search`), agent cards, wallet-to-agent resolution, cross-chain identity lookups, and metadata nonce generation. Metadata upload costs $0.10 per call. The `/stats` endpoint costs $0.01. Free endpoints include `/health`, `/stats/public`, `/agents/top`, and public metadata retrieval. All paid endpoints use the x402 protocol with fixed pricing, paying to address `0xb273616670037C0870E9835B3FFBE68f58de68B0` on Base.\n\nThe API is documented via OpenAPI 3.1.0 (version 1.2.0) and uses API key authentication (via `X-API-Key` header) for non-paid endpoints, while paid endpoints accept x402 payment challenges. Response schemas are well-defined, including `ScorePublicResponse` with fields for score, score_tier, trust_tier, confidence level, and adjustment reasons.","tags":[],"capabilities":["agent-trust-score","agent-search","agent-metadata","agent-identity-resolution","agent-validation-history","agent-card","wallet-agent-lookup","platform-stats","erc-8004","x402-payment","multi-chain","metadata-upload"],"categories":["blockchain","trust","search"],"synonyms":["ERC-8004","agent trust score","agent reputation","on-chain agent registry","AI agent trust","agent oracle","8k4 protocol","agent identity","agent validation"],"warnings":["External documentation at https://8k4protocol.com/docs/ was not crawled; details may differ from OpenAPI spec","The /metrics endpoint is not explicitly listed in the OpenAPI spec paths, though it returns a valid x402 challenge","Response example for ScorePublicResponse is inferred from schema field names and types, not from an actual API response"],"endpointUrl":"https://api.8k4protocol.com/metrics","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb273616670037C0870E9835B3FFBE68f58de68B0","amount":"10000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.1.0 schema with well-defined request/response models, clear x402 pricing on all paid endpoints, and a live 402 challenge captured on /metrics. Docs link exists but external docs page was not crawled, and no usage examples are provided in the spec itself. Response example is inferred from 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'/agents':127,135 '/agents/search':145 '/agents/top':178 '/health':176 '/metrics':77 '/score':130 '/score/explain':138 '/stats':169 '/stats/public':177 '0.001':119 '0.01':93,172 '0.10':165 '0xb273616670037c0870e9835b3ffbe68f58de68b0':196 '1.2.0':207 '3.1.0':205 '8453':100 '8k4 protocol' '8k4protocol':39 'AI agent trust' 'ERC-8004' 'accept':227 'across':70 'address':195 'adjust':250 'agent':3,18,60,69,123,128,136,139,143,146,151 'agent identity' 'agent oracle' 'agent reputation' 'agent trust score' 'agent validation' 'agent-card' 'agent-identity-resolution' 'agent-metadata' 'agent-search' 'agent-trust-score' 'agent-validation-history' 'ai':59 'api':35,45,108,200,210,216 'authent':212 'base':15,30,72,98,198 'behind':88 'broader':107 'bsc':71 'call':95,167 'card':147 'chain':58,75,155 'challeng':230 'coinbas':103 'confid':247 'cost':164,171 'cross':154 'cross-chain':153 'defin':236 'document':202 'eip155':99 'endpoint':78,115,117,170,174,185,223,226 'erc':1,16,32,64 'erc-8004' 'ethereum':74 'explan':132 'facilit':105 'field':240 'fix':191 'free':114,173 'gate':87 'generat':161 'header':218 'histori':141 'id':129,137 'ident':9,24,53,156 'includ':110,122,175,237 'key':211,217 'level':83,248 'lookup':10,25,126,157 'metadata':7,22,50,159,162,181 'metadata-upload' 'metric':84 'micropay':13,28 'multi-chain' 'non':221 'non-paid':220 'nonc':160 'note':121 'numer':111 'on-chain':56 'on-chain agent registry' 'openapi':204 'oracl':37 'paid':112,116,184,222,225 'pay':193 'payment':91,229 'per':94,166 'platform':82 'platform-level':81 'platform-stats' 'positives/cautions':134 'price':192 'protocol':189 'provid':47 'public':180 'read':43 'read-on':42 'reason':251 'regist':61 'resolut':54,152 'respons':231 'retriev':182 'return':80 'schema':232 'score':5,20,49,125,131,242,243 'scorepublicrespons':238 'search':6,21,51,144 'semant':142 'settl':96 'specif':79 'standard':66 'support':68 'surfac':109 'tier':244,246 'trust':4,19,34,48,124,245 'unless':120 'upload':163 'use':186,209 'valid':140 'version':206 'via':11,26,101,203,213 'wallet':149 'wallet-agent-lookup' 'wallet-to-ag':148 'well':235 'well-defin':234 'x':215 'x-api-key':214 'x402':12,27,90,104,188,228 'x402-payment'","prices":[{"id":"d4dcfde4-a5bb-46a2-ba43-549c97252c36","listingId":"09fa7c3d-c74f-4f28-894a-b1b824723996","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0xb273616670037C0870E9835B3FFBE68f58de68B0","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb273616670037C0870E9835B3FFBE68f58de68B0","amount":"10000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:37.598Z"}],"sources":[{"listingId":"09fa7c3d-c74f-4f28-894a-b1b824723996","source":"x402_bazaar","sourceId":"https://api.8k4protocol.com/metrics","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.598Z","lastSeenAt":"2026-04-22T05:32:29.865Z"}],"details":{"listingId":"09fa7c3d-c74f-4f28-894a-b1b824723996","quickStartSnippet":"# Get the trust score for agent 42 on BSC (requires x402 payment)\ncurl -X GET 'https://api.8k4protocol.com/agents/42/score?chain=bsc'\n# Returns 402 with x402 challenge; pay and retry with payment header\n\n# Free: get top agents\ncurl -X GET 'https://api.8k4protocol.com/agents/top?limit=5&chain=bsc'","exampleRequest":null,"exampleResponse":{"as_of":"2025-01-15T12:00:00Z","chain":"bsc","score":0.85,"adjusted":false,"agent_id":42,"global_id":"bsc:42","confidence":"medium","disclaimer":"Scores are informational only.","score_tier":"high","trust_tier":"trusted","score_version":2,"adjustment_reasons":[],"validator_count_bucket":"10-50"},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The API is titled 'ERC-8004 Trust API' version 1.2.0 described as 'The Oracle - Read-only API for agent trust scores'","source_url":"https://api.8k4protocol.com"},{"claim":"The /metrics endpoint returns a 402 challenge with price $0.01 on Base (eip155:8453)","source_url":"https://api.8k4protocol.com/metrics"},{"claim":"Paid endpoints pay to 0xb273616670037C0870E9835B3FFBE68f58de68B0 via Coinbase x402 facilitator","source_url":"https://api.8k4protocol.com"},{"claim":"Agent search endpoint costs $0.001 per call with x402 fixed pricing","source_url":"https://api.8k4protocol.com"},{"claim":"Metadata upload costs $0.10 per call","source_url":"https://api.8k4protocol.com"},{"claim":"Supports chains: bsc, base, eth","source_url":"https://api.8k4protocol.com"}],"useCases":["Look up the trust score and tier of an ERC-8004 registered AI agent before delegating a task","Search for agents capable of a specific task, filtered by minimum trust score and chain","Resolve a wallet address to its registered agents and their trust scores","Upload or retrieve on-chain metadata for an ERC-8004 agent","Audit an agent's validation history including on-chain feedback and ratings"],"bestFor":["AI agent orchestrators that need to evaluate agent trustworthiness before delegation","Multi-agent systems requiring on-chain reputation data across BSC, Base, and Ethereum","Developers building agent marketplaces or directories with trust-based ranking"],"notFor":["General-purpose blockchain analytics unrelated to ERC-8004 agents","Applications needing sub-cent micropayments (minimum call cost is $0.001)","Off-chain agent reputation systems with no ERC-8004 registration"],"kindDetails":{},"updatedAt":"2026-04-22T02:17:49.892Z"}}