established · 0.7 capabilitymarket schemadomain

x402

Score 28.9 / 100 128 providers +2 via APIs 156 APIs Search apis.io →

Providers using this tag (128)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 13 Complete, well-documented, and agent-ready
AgoragenticAgentsAgentic CommerceAgent RuntimeMarketplace3 APIs80.5Hive CivilizationAgentsAgentic CommerceA2AMCP2 APIs74.8MandateShieldCompanyPaymentsAgentic CommerceAI Agents1 API73.9DelxAgentsAI AgentsMCPA2A4 APIs72.6DrippayCompanyBillingUsage-Based BillingMetering1 API72.00xArchiveMarket DataHistorical DataCryptoDeFi2 APIs71.6HiltPaymentsSolanaStablecoinsUSDC2 APIs71.3SCVD General StoreAgentsAgentic CommercePayments3 APIs70.7TaskHawk SystemsAI GovernanceAgent SecurityRuntime EnforcementPolicy Enforcement1 API69.9FeedOracle TechnologiesCompanyMCPAgent InfrastructureA2A3 APIs69.1Dynamic FeedLive DataAI AgentsMCPA2A2 APIs67.9AlgoVoiPaymentsAgentic CommerceA2A5 APIs67.0EmbossPDFFormsDocument ProcessingForm Filling2 APIs67.0
Strong 20 Solid coverage with minor gaps
cogDepotCompanyAI AgentsAgent MarketplaceMarketplace1 API65.9Agent ReadyAgentsAgent ReadinessWebsite ScanningDeveloper Tools1 API63.5MolTrustAI AgentsAgent IdentityDecentralized IdentityVerifiable Credentials2 APIs63.5aicomglobalAgentsAgentic CommerceA2AMCP1 API60.4invinoveritasAI AgentsAgent VerificationAgent GovernanceMCP1 API58.7MERCURYCompanyAgentsA2AMCP1 API58.6PagesnapDeveloper ToolsWeb Scrapingweb-to-markdownscreenshot-api1 API58.5Ultravioleta DAOCompanyAI AgentsAgent MarketplaceTask Marketplace1 API58.4x402 List APICrypto402Agentic Payments1 API58.4PostalFormPhysical MailPrint & MailPostal MailCertified Mail4 APIs58.1CONNSKILLCompanyAPI ProviderSEOSERP1 API57.8HumanMirrorCompanyAI AgentsAgent SecurityPrompt Injection Defense16 APIs56.9iwant.fyiAgentic CommerceMarketplaceAI AgentsPurchase Intent1 API56.9Atomadic TechCompanyAI AgentsAgent InfrastructureMCP1 API56.7gpt55-token-gatewayAgentic PaymentsMCPA2A5 APIs56.5GradeIPTVStreamingLive TVLive Radio1 API56.2broke2builtCompanyAI AgentsAgent ToolsData Intelligence3 APIs56.1Council of AIAI GovernanceAI MeasurementAI SafetyEU AI Act2 APIs54.9AnyAPIDeveloper ToolsDataSearchScraping2 APIs54.8Green HelixAgentsAgentic CommercePaymentsEscrow1 API54.3
Developing 58 Usable, with meaningful gaps to close
ClawSpanAI AgentsAgent MarketplaceAgent-NativeMCP2 APIs54.2AmbrCompanyAI AgentsAgentic CommerceContracts3 APIs53.72sAgentsAgentic CommerceMCP3 APIs53.5APIMeshWeb AnalysisSEOWeb SecurityEmail Verification2 APIs53.5LVL LTD COAgentsAgentic CommerceAgent SkillsA2A1 API53.4Vaultfire ProtocolAI AgentsAgent IdentityTrustReputation1 API52.8ChainAware.aiBlockchainWeb3DeFiFraud Prevention1 API52.5Hive Agent IQAgentsAgentic CommerceA2AMCP4 APIs52.3HyperbrowserHeadless BrowserBrowser InfrastructureWeb ScrapingWeb Crawling1 API52.3ByKaranteliCryptocurrencyCrypto DerivativesMarket DataFunding Rates1 API51.9SolvelaCompanyPaymentsArtificial IntelligenceLLM Gateway1 API51.1FarmDash Agent HubDeFiDeFAIAI AgentsMCP1 API51.0XGuardAgentsAgentic CommerceMCP4 APIs50.8Kann KI das? Sponsoring AgentCompanySponsoringAdvertisingSoftware Reviews1 API50.6PlyriumCompanyAgent SkillsSupply Chain SecuritySoftware Provenance1 API50.6Macaroon NetworkAgentsAgentic CommerceA2AMCP4 APIs50.4GloriaCompanyNewsCryptoCryptocurrency1 API50.2Meta Agent ToolsDeveloper ToolsAPI RegistryAgent RegistryMCP1 API50.1Decision AnchorAgentsAgent AccountabilityDecision RecordsAudit Trail1 API49.4FigmentStakingBlockchainDigital AssetsProof of Stake1 API49.1Pictomancer.aiCompanyImageImage OptimizationImage Processing1 API49.1Agent ExchangeAgentsAgentic CommerceMCP5 APIs47.5HookPulseMonitoringObservabilityCronWebhook1 API47.4AvalixAgentsAgentic CommerceA2AMCP3 APIs47.3SirenicCompany DataBusiness RegistryKYBSanctions Screening1 API47.3TrustBoost PII SanitizerPrivacyPII RedactionData ProtectionLLM Security3 APIs47.2Coin RailzCompanyPaymentsAgents2 APIs46.9Hergert SynthoraCompanyAgentsA2AMCP2 APIs46.71F916AI AgentsAgent SocietyForumsMCP1 API46.6anchor-x402CompanyAgentsPayments1 API46.5CommsHarborEmailTransactional EmailEmail MarketingCommunications2 APIs46.5SpongeCompanyAgentic PaymentsAI AgentsWallets1 API46.3PageAuditTechnical SEOSEO auditingDeveloper ToolsAgent-Native1 API46.0ServGhost Agent APICloud InfrastructureVPS hostingDedicated ServersGPU Compute1 API45.6Verified Digital Agents (VDA)CompanyAI AgentsAI GovernanceCompliance6 APIs45.4Merit SystemsCompanyAgentic CommercePayments2 APIs45.3Seshat MarketsFinanceFintechCryptoCommodities1 API45.3ingest0rCompanyReal EstateProperty RecordsProperty Data1 API45.1Phi LongevityCompanyHealthcareHealth DataLab Results2 APIs44.9PolicyCheckCompanyPolicy AnalysisConsumer ProtectionE-Commerce1 API44.7brick.blueAI AgentsAgent MarketplaceAgent DiscoveryTask Exchange1 API44.601MindAgentsAgentic CommerceA2AMCP3 APIs44.3MUJ428AgentsAgent TrustAgentic CommerceA2A3 APIs44.1HostDeFiSolanaToken RiskDeFirug pull1 API44.0Agent ZeroAgentsAgent IntelligenceERC-80041 API43.6Marz Greta-Lock NetworkCompanyAI AgentsAgent EvaluationBenchmarking1 API43.5CoinbaseBlockchainCryptocurrencyCustodyExchange5 APIs43.2Liquid AgentTokenized StocksDeFiInvestingAgentic Commerce1 API43.2WarpPay402 StudioMicropaymentsAI AgentsMCP1 API41.7EditalMDGovTechPublic ProcurementBrazilPNCP1 API41.3TradeDataHub Public APIcontractor dataB2B DataBusiness ListingsDatasets1 API41.0Radar CNPJBusiness & Company DataGovernment open dataReceita FederalCNPJ1 API40.6PaulieB14BlockchainOn-Chain DataThe GraphSubgraph1 API40.4AGENTUMCompanyBusiness IntelligenceKYBCompany Data3 APIs39.9Agent Health MonitorAgentsAgent TrustRisk ScoringWallet Intelligence2 APIs39.6PoolPartyMedia DistributionBroadcastingVideoAgents3 APIs39.5agent402.devCompanyAgentic PaymentsAgentic Commerce1 API39.3ExponentialCompanyDeFiDecentralized FinanceYield2 APIs39.3
Thin 24 Limited public surface area
BerrerAgentsAgentic CommerceA2AMCP3 APIs39.2GONNACompanyAgentsAgentic Commerce1 API38.7BMC XIVCompanySecurityCybersecurityBreach Intelligence1 API37.5SINCORCompanyAI AgentsA2AAgentic Commerce1 API37.4KG-NINJAAgentsAgentic CommerceA2AMCP3 APIs37.2DEUSPROOFAgentsAgent IdentityProvenanceNotary3 APIs37.1AIScanAI VisibilityWebsite AuditingSEOAnswer Engine Optimization1 API35.6_doneDeveloper ToolsUtility APIsAI AgentsAgent-Native52 APIs34.6QoreviaMarket DataGoldXAUUSDTrading2 APIs33.6Scro Orphan DeskAI AgentsA2ADeFi1 API33.3KiteAgentic PaymentsAI AgentsStablecoins3 APIs33.2Chado StudioAgentsA2ADeFi1 API33.0OnTopX402USDCAgentic Paymentspaid-placement2 APIs30.9SnowSignalsCryptoMarket DataBitcoinAnalytics2 APIs30.9Artem / A2A SandboxAgentsAgentic CommerceA2A2 APIs30.5X402 AI 自助门店Agentic CommerceAI AgentsA2A1 API30.2ARAKEL Machine Evidence Networkmachine-evidenceComplianceSanctions ScreeningOFAC1 API29.7AgMsgMessagingAI AgentsA2AChat1 API29.6IntentGuardCompanyArtificial IntelligenceAgentsModel Routing1 API29.5Serbia Company DataSerbiaCompany DataBusiness RegistryOpen Data1 API28.0EventEdge OraclePrediction MarketsAI AgentsPolymarket1 API27.6openclaw / evm-labAgentsA2AXRPL2 APIs26.5Wib&Wob (symbients)CompanyAgentsA2A1 API26.3BlockscoutBlockscoutWeb3ExplorerOpen Source1 API26.2
Emerging 13 Early or largely undocumented
Grok & MonAI AgentsA2AMCP3 APIs25.1ScalpStreamCompanyAgentsA2A5 APIs24.8KOA LabsAgentsMCPA2AAgent Discovery2 APIs23.5CablesMCP ServerAgent-Nativepay-per-call1 API22.9MoleculeCompanyDeSciDecentralized ScienceBlockchain1 API22.6Gleeful AIArtificial IntelligenceAgentsMicropayments1 API20.6ZeroclickCompanyArtificial IntelligenceAgentic CommerceAgentic Payments19.9Nous ResearchCompanyArtificial IntelligenceMachine LearningLLM2 APIs19.0Verse (autonomous agent)CompanyAI AgentsAutonomous AgentsA2A2 APIs18.6RedotpayCompanyPaymentsFintechStablecoins1 API18.354ch10Wallet RiskPhishingScam Detectionurl reputation1 API17.3callagent.proAI AgentsVoiceTelephonyPhone Agents1 API17.0APEXBlockchainCryptocurrencyFaucetSolana1 API12.0

APIs with this tag (153)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 22 Complete, well-documented, and agent-ready
Agoragentic Agent OS and Marketplace Router APIThe public Agent OS and task-router contract: quickstart registration (POST /api/quickstart returns an amk_...80.5Hive MCP Gateway and RegistryProvider-operated remote MCP gateway on Render (named as the MCP transport by receipts.thehiveryiq.com/.wel...74.8Hive Receipts and Agent Commerce API (HiveMorph)Pay-per-call REST API on receipts.thehiveryiq.com for signing and verifying receipts (free tier: 100 dual-s...74.8HiveCompute Inference Router APIOpenAI-compatible inference router on api.thehiveryiq.com: chat completions, text completions and embedding...74.8Delx Commerce x402 APIDelx Commerce is the paid sibling of the Protocol: 987 pay-per-result HTTP routes under https://api.delx.ai...72.6Hilt API (Pay API + Workspace)The Hilt REST contract: Hilt Pay API /v1/access routes (agent bootstrap, apps, products, x402 V2 payment se...71.3Hilt Pay Agent Gateway (MCP + A2A)Hosted MCP server at https://api.hilt.so/mcp (streamable HTTP, protocol 2025-06-18, server Hilt Pay Agent G...71.3Hilt Solana Transaction Evidence APIA public pay-per-request x402 V2 resource on www.hilt.so (0.05 USDC per request, Solana USDC): POST /v1/sol...71.3Browser Use X402 APIThe x402 API from Browser Use — 1 operation(s) for x402.70.8SCVD Evidence Agent (A2A)Agent2Agent protocol surface: an agent card served from https://scvd.store/.well-known/agent-card.json (and...70.7SCVD General Store APIThe HTTP contract for scvd.store: 196 operations on 180 paths (OpenAPI 3.1.0, every operation with a unique...70.7SCVD General Store MCP ServersThree remote Model Context Protocol servers on the apex host, all Streamable HTTP and all answering initial...70.7Cracked API X402 APIThe X402 API from Cracked API — 1 operation(s) for x402.70.3Kevros Governance APIREST gateway for runtime enforcement of autonomous agent actions. POST /governance/verify returns a signed ...69.9ToolOracle MCP Platform APIThe provider's root OpenAPI 3.0.0 contract (version 4.2.0): a discovery index of forty hosted MCP endpoints...69.1ToolOracle x402 v2 Compliance, Evidence & Agent-Safety APIAccount-less pay-per-call REST API (OpenAPI 3.1.0 with schemas and examples on every operation): agent acti...69.1Dynamic Feed REST APIThe full REST surface: 158 operations on https://dynamicfeed.ai — the keyless POST /v1/batch tool dispatche...67.9AlgoVoi Agent Trust Bench APIOpen, provider-neutral x402 research surface (OpenAPI 3.1.0 "AlgoVoi Agent Trust Bench" 0.1.0, 7 operations...67.0AlgoVoi Gateway APIThe multi-tenant payment gateway (OpenAPI 3.1.0 "AlgoVoi Gateway" 1.0.0-phase1c, 115 operations, 99 schemas...67.0AlgoVoi Pay (Payable Core) APITenant-free, pay-per-call verification rail (OpenAPI 3.1.0 "AlgoVoi Payable Core" 1.0.0, 17 operations). No...67.0Emboss A2A AgentAgent2Agent interface at https://api.getemboss.ai/a2a (JSON-RPC, A2A 1.0) discovered through a signed agent...67.0Emboss Pay-per-call APIThe anonymous pay door at api.getemboss.ai/pay: make fillable, fill from data, fill with context, read a fi...67.0
Strong 27 Solid coverage with minor gaps
cogDepot APIThe REST API behind the marketplace: open self-registration (POST /v1/account/register), profile and deal-r...65.9Agent Ready APIREST API for agent-ready.dev scans, published as OpenAPI 3.1.0 at https://agent-ready.dev/api/v1/openapi.js...63.5MoltGuard APITrust and integrity sub-API of MolTrust (Hono/Node, v1.5.0, 71 operations across 14 capability clusters): B...63.5MolTrust APIREST trust-registry API (FastAPI, v2.5, 186 operations): agent registration and DID resolution, W3C VC issu...63.5aicomglobal APIAgent-consumable REST surface for aicomglobal, published as OpenAPI 3.1.0 at https://aicomglobal.com/openap...60.4invinoveritas APIREST API on api.babyblueviper.com (FastAPI, OpenAPI 3.1.0, version 1.13.0, 174 paths / 187 operations): pre...58.7MERCURY MCP ServerHosted Model Context Protocol server (serverInfo mercury-x402 1.0.0, protocolVersion 2025-06-18, streamable...58.6MERCURY Web Fetch A2A AgentAgent-to-Agent (A2A 0.3.0) surface for "MERCURY Web Fetch", published as a conformant agent card at https:/...58.6MERCURY x402 Storefront APIREST/JSON API (OpenAPI 3.1.0, info.title "MERCURY x402 storefront", x-spec mercury-storefront/1) of 19 GET ...58.6Pagesnap X402 APIKeyless USDC per-call payment58.5Execution Market REST API216-operation REST API (OpenAPI 3.1, info.version 2.0.0) for publishing tasks with USDC bounties, applying ...58.4PostalForm Machine Payments APIMachine-oriented print-and-mail REST API for autonomous agents: validate and quote, then create, pay for an...58.1CONNSKILL Growth Services A2A AgentA2A merchant agent (protocolVersion 0.3.0, JSON-RPC at agent.connskill.com/a2a) whose card at /.well-known/...57.8CONNSKILL Growth Services APIPay-per-call REST API for AI agents on agent.connskill.com: Google SERP snapshots, keyword metrics/ideas/di...57.8CONNSKILL Growth Services MCP ServerModel Context Protocol surface for the same catalogue: a hosted Streamable-HTTP endpoint at agent.connskill...57.8HumanMirror Agent OS APICryptographic Proof-of-State and exact SHA-256 state-continuity drift detection (state-and-trust, 0.050 USD...56.9HumanMirror Automata APIPublic machine catalog and status for HumanMirror Automata, the family of ~35 operational guard services (r...56.9HumanMirror Intent Market APINon-custodial intent marketplace for autonomous agents: buyers publish a paid intent (0.010 USDC via x402),...56.9HumanMirror M2M Core ServicesThree separately published contracts for the M2M core: Sanitize Shield (indirect prompt-injection quarantin...56.9HumanMirror Physical Oracle APIBeta (1.0.0-beta) agent-to-human field-verification network: quote and post bounded public-world verificati...56.9HumanMirror X402 APIHumanMirror x402 API v3.2.0: 82 pay-per-call operations settled in USDC on Base through x402 V2 — agent sec...56.9AAAA Nexus APIPay-per-call REST API for autonomous agents: threat scoring, trust and reputation oracles, escrow, SLA bond...56.7GPT55 Model Gateway A2A AgentAgent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and iden...56.5GPT55 Model Gateway APIOpenAI-compatible, x402-paid model gateway at https://gpt55.558686.xyz. The provider's own OpenAPI 3.1.0 do...56.5GPT55 x402 Gateway MCP ServerRemote Model Context Protocol server at https://gpt55.558686.xyz/mcp (Streamable HTTP; a GET returns the se...56.5Council of AI GSPC MCP ServerRemote Model Context Protocol server at https://councilof.ai/mcp (Streamable HTTP, protocol 2025-06-18, ser...54.9Council of AI Public APIKeyless REST API for the GSPC measurement estate: the living board (GET /api/gspc, one axis via ?axis=), th...54.9
Developing 67 Usable, with meaningful gaps to close
Ambr REST APIJSON REST API at https://getamber.dev/api/v1 for the full mandate lifecycle: list templates (public), creat...53.72s A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://2s.io/.well-known/agent-card.json (pr...53.52s APIThe full 2s REST catalog: 575 operations (470 GET, 105 POST) in one OpenAPI 3.1.0 document with servers[] h...53.52s MCP ServerRemote Model Context Protocol server at https://2s.io/mcp (Streamable HTTP, POST only, protocol version 202...53.5APIMesh MCP Server@mbeato/apimesh-mcp-server (npm, v1.8.2, 2026-04-26; io.github.mbeato/apimesh in the official MCP registry)...53.5APIMesh Web Analysis APIsThe pay-per-call marketplace surface: one API per subdomain (https://{api-name}.apimesh.xyz) with free GET ...53.5LVL LTD Agent Skill Market APIREST contract for the x402 skill marketplace: health and readiness probes, the ESP (Evaluate -> Settle -> P...53.4LVL LTD Skill Market A2A AgentAgent2Agent surface: an Ed25519-JWS-signed agent card (protocolVersion 1.0.0, JSONRPC transport, version 1....53.4Vaultfire Trust Service (x402)The priced projection of the same trust surface: 77 endpoints under /api/x402/* (29 priced GET reads, 46 pr...52.8ChainAware A2A Agent and x402 APIAgent-facing surface on api.chainaware.ai: an A2A 0.3.0 agent card at /.well-known/agent-card.json (also at...52.5HiveBank Treasury Attestation & Settlement APIAgent treasury layer on hivebank.hiveagentiq.com: the served OpenAPI 3.0.3 covers custody and treasury-poli...52.3HiveGate Admission, Identity & Pricing Tier APIOnboarding gateway for the Hive network on hivegate.hiveagentiq.com: POST /v1/gate/onboard mints the first ...52.3HiveLaw AI Legal Contracts & Compliance APILegal and compliance layer on hivelaw.hiveagentiq.com: contract drafting, AI review and on-chain sealing ($...52.3HiveTrust KYA Identity & Trust APIIdentity and trust substrate for AI agents on hivetrust.hiveagentiq.com: DID issuance ($1.00 USDC), W3C VC ...52.3Hyperbrowser Web APIStateless web utilities: fetch a single page, run a web search, or start a crawl. Includes `/x402` micropay...52.3Hyperbrowser X402 APIThe X402 API from Hyperbrowser — 2 operation(s) for x402.52.3ByKaranteli X402 APIPer-call priced history and depth endpoints, settled in USDC over the x402 protocol on Solana and Base main...51.9Solvela Gateway APIOpenAI-compatible chat completions paid per request in USDC-SPL on Solana via x402: POST /v1/chat/completio...51.1XGuard A2A AgentAgent2Agent surface: an agent card served identically from https://api.xguardgate.com/.well-known/agent-car...50.8XGuard Reconcile APIA one-operation companion service at https://reconcile.xguardgate.com that resolves ambiguous x402 Base USD...50.8XGuard Universal Paid AI Agent + Secretless Gateway APIThe REST surface behind every XGuard product, published as OpenAPI 3.1.0 (info.version 5.1.0, 47 paths, 49 ...50.8Kann KI das? APIFaceted product and category search over the published build-or-buy analyses, suggestions and nearest-neigh...50.6VouchSpec Agent Skill Evidence APIAgent-only API for purchasing fresh, isolated static validation and signed evidence for one exact immutable...50.6Macaroon Network Agent Services APIThe REST surface behind the marketplace: anonymous discovery (GET /listings, /listings/search?intent=, /api...50.4Macaroon Network MCP ServerThe network router MCP server — a live Streamable HTTP endpoint at https://api.macaroonnetwork.com/mcp (ser...50.4Gloria MCP ServerHosted, remote MCP server (Streamable HTTP at https://mcp.itsgloria.ai/mcp, serverInfo "Gloria AI" 1.26.0, ...50.2Gloria X402 APIPay-per-request access to Gloria news over the x402 protocol with no account or API key: GET /news ($0.03),...50.2Decision Anchor APIREST API for the External Anchoring Layer: agent self-registration (no auth; issues a bearer auth_token, a ...49.4Figment X402 APIThe x402 API from Figment — 5 operation(s) for x402.49.1Agent Exchange API StoreThe pay-per-call data API for AI agents at https://store.agentexchange.work: an OpenAPI 3.1.0 document (inf...47.5Agent Exchange MCP ServerRemote Model Context Protocol server at https://store.agentexchange.work/mcp (Streamable HTTP; a GET return...47.5Agent PlanetsA persistent world for AI agents at https://planets.agentexchange.work — claim a free planet (POST /api/cla...47.5Gatekeeper OracleA pay-per-question oracle served at https://agentexchange.work/oracle and https://gatekeeper.agentexchange....47.5The Agent Exchange Clearing HouseThe agent-to-agent task market at https://exchange.agentexchange.work: agents register a free reputation pa...47.5Autonoma A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://avalix.ai/.well-known/agent-card.json...47.3Autonoma Trust Gate APIAgent-consumable REST API for Autonoma, Avalix's disclosed autonomous AI operator. 33 paths under https://a...47.3Sirenic A2A AgentAgent2Agent JSON-RPC endpoint exposing the 116 paid routes as A2A skills (skill ids are the OpenAPI path te...47.3Sirenic APIPay-per-call REST API for official French and European company data: company search and profiles by SIREN/S...47.3Sirenic MCP ServerRemote Model Context Protocol server (streamable HTTP) over the same official French and European company-d...47.3TrustBoost A2A AgentAgent2Agent surface: an agent card served from https://api.trustboost.dev/.well-known/agent-card.json (vers...47.2TrustBoost PII Sanitizer APIREST contract for the sanitizer: POST /sanitize (redact PII from up to 10,000 characters with an optional c...47.2Coin Railz Agent Payment APIThe full Coin Railz surface: onboarding and prepaid-credit operations (free $5 trial key, Stripe hosted che...46.9Coin Railz x402 Micropayment ServicesThe 80 pay-per-request services as a standalone OpenAPI 3.0.3 contract (one POST /x402/ per service, price ...46.9SYNTHORA Agent NotaryProof-of-existence, proof-of-execution and proof-of-agreement for machine-to-machine deals: notarize a SHA-...46.7SYNTHORA Machine-Payable API MeshAggregate contract for the SYNTHORA x402 mesh: pay-per-call intelligence verdicts (contract safety, wallet ...46.7SYNTHORA x402 Per-Service ContractsThe individual OpenAPI contracts published by the SYNTHORA product hosts under *.hergertsynthora.com - one ...46.7ServGhost Agent APIREST API for provisioning VPS, dedicated servers, Windows RDP, GPU AI hosting, and anonymous domains. Beare...45.6GOSCE Agent Portfolio and RouterThe GOSCE (GitHub Open-Source Combination Engine) fleet: 98 templated remote MCP + A2A agents at .getvda.ai...45.4Cook County (Chicago) Property Records APIFour GET operations on https://api.ingest0r.com described by the provider's OpenAPI 3.1 (version 0.4.2): v1...45.1Cook County (Chicago) Property Records MCP ServerA live remote MCP server at https://api.ingest0r.com/mcp (streamable-http, JSON-RPC 2.0 over HTTP POST, pro...45.1Phi Longevity PRISM MCP ServerOfficial Model Context Protocol server for the PRISM biomarker-analysis engine. Hosted Streamable HTTP at h...44.9PolicyCheck x402 Analysis APIPay-per-request analysis over the x402 protocol: POST https://policycheck.tools/api/x402/analyze answers HT...44.701Mind A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://01mind.net/.well-known/agent-card.jso...44.301Mind Agent Superstore APIAgent-consumable REST API for the 01Mind superstore: purchase-and-collect execution of catalogue listings (...44.3MUJ428 Trust Layer APIREST facade for the MUJ428 Trust Layer, served as Supabase edge functions at https://wepmhfjzckclvywolrek.s...44.1Agent Zero A2A AgentAgent2Agent surface: an agent card served from https://onchainagentintel.io/.well-known/agent-card.json (mi...43.6Agent Zero ERC-8004 Agent Intelligence APIREST API for ERC-8004 agent intelligence on Base and Ethereum. Free public operations (coverage stats, lead...43.6EQ Scoring Platform APIREST API (OpenAPI 3.1, 133 operations) for scoring AI-generated text against 28 human personality profiles....43.5Liquid Agent Tokenized Stock Index and Gas Sponsor APIAgent-facing REST API on Base (eip155:8453). Free reads (basket constituents and live prices, vault NAV and...43.2WarpPay402 MCP ServerHosted MCP server at https://api.warppay402.com/mcp exposing the same 19 tools as the REST API (public_data...41.7WarpPay402 Monetized MCP Tools APIREST surface of the WarpPay402 gateway at https://api.warppay402.com: 19 operations (2 GET feeds, 1 GET yie...41.7Graph Advocate APIRouting and trader-intelligence API at graphadvocate.com. POST / speaks A2A JSON-RPC 2.0 (message/send) and...40.4AGENTUM APIs BrasilThe agentum.lat host: nine pay-per-call routes — GET /verificar-cnpj (CNPJ registration status, Simples Nac...39.9AGENTUM Business APIThe business.agentum.lat host ("AGENTUM Business", a separately deployed service with its own payout wallet...39.9Agent Health Monitor APIREST API for agent-wallet trust and health on Base L2, published as OpenAPI 3.1.0 (v1.8.0) at https://agent...39.6AHM Verify APIPost-transaction output-quality scoring: register a job specification (POST /v1/specs, free), submit an age...39.6Agent402 Direct x402 HTTP ResourcesEight x402-priced and four free direct HTTP resources on agent402.dev, described by one OpenAPI 3.1 contrac...39.3
Thin 25 Limited public surface area
BerrerGate A2A AgentAgent2Agent surface: an agent card served from https://api.berrergate.com/.well-known/agent-card.json (cont...39.2BerrerGate Tool & Provider Intelligence APIAgent-consumable REST API at https://api.berrergate.com: free procurement and discovery previews over ten c...39.2LEGIT A2A Agent CardAgent card served from https://legit.gonna.bond/.well-known/agent.json and, byte-identical, from the canoni...38.7LEGIT Trust APIREST API for the LEGIT trust oracle: trust-check one x402 merchant address (score, grade, uptime, latency, ...38.7Breach402 APIOwner-verified breach exposure checks for autonomous agents. Twelve operations: five discovery GETs that se...37.5Agent Verification Utility A2A AgentAgent2Agent (A2A) 1.0 surface: an agent card served from https://agent-economy.kgninja.dev/.well-known/agen...37.2Agent Verification Utility APIREST contract for the Agent Verification Utility: a free precheck (POST /validate-request) that binds a ver...37.2Agent Verification Utility MCP ServerRemote Model Context Protocol server at https://agent-economy.kgninja.dev/mcp — stateless Streamable HTTP, ...37.2AIScan A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://getaiscan.app/.well-known/agent-card....35.6AIScan Agent APIPay-per-capability REST API for AI-visibility auditing: five cheap HTTP checks (site health and AI-crawler ...35.6_done CatalogSingle-page agent-native catalog of the 27 _done pay-per-call utility APIs. Publishes a real llms.txt, a ro...34.6Qorevia Market Intelligence APIThe x402 pay-per-call REST surface, published as OpenAPI 3.1.0 "Qorevia Market Intelligence" 2.0.0 at https...33.6Qorevia Universal Agent Gateway (MCP + A2A)The free discovery and routing layer in front of the paid tools, served from the same origin. MCP: https://...33.6Scro Orphan Desk Intent Echo APIThe desk's HTTP/JSON surface on https://dualregistry.dev, described by a served OpenAPI 3.0.3 stub of 7 ope...33.3crvUSD Yield Optimizer A2A AgentAgent2Agent surface of the same service: an agent card at https://llama.box/yo/.well-known/agent.json (prot...33.0crvUSD Yield Optimizer APIREST contract for the crvUSD Yield Optimizer (OpenAPI 3.1.0, info.version 1.1.0, servers[] "/yo" on llama.b...33.0Sandbox Contractor Agent (A2A)Agent2Agent protocol surface: an agent card served from https://a2a.elonsusk.com/.well-known/agent-card.jso...30.5Sandbox Contractor Agent REST APIThe HTTP surface of the Sandbox Contractor Agent, published as an OpenAPI 3.1.0 document (FastAPI, info.tit...30.5X402 AI 自助门店 Store APIThe store's public JSON surface: the service catalog with USD prices and the x402 payment block (GET /api/c...30.2X402 AI 自助门店 x402 Facilitator APIA self-hosted x402 facilitator role on the same host - POST /facilitator/verify and POST /facilitator/settl...30.2AgMsg APIAgent-only messaging API: two open registration operations (request a TAN, then create the account and rece...29.6IntentGuard Router APIx402-paid AI model routing and prompt optimization from IntentGuard - 3 operations: a free routing preview ...29.5onchain-risk-oracle A2A AgentAgent2Agent (A2A) protocol surface: an agent card at https://oracle.evebrief.org/.well-known/agent-card.jso...26.5onchain-risk-oracle APIThe FastAPI-generated OpenAPI 3.1.0 contract (info.title onchain-risk-oracle, version 0.1.0) for the oracle...26.5Scramble APIPet, sign for, feed and read the state of Scramble, the recursive cat who lives with Wib&Wob. Ten operation...26.3
Emerging 12 Early or largely undocumented
GanjaMon AI A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://grokandmon.com/.well-known/agent-card...25.1Grok & Mon REST APIThe JSON REST origin under https://grokandmon.com/api/ that the website, the MCP tools and the ACP endpoint...25.1AirScoutMachine-payable air-quality queries over x402 with global coverage: current US AQI and pollutant breakdown ...24.8BorderScoutMachine-payable US border-crossing queries over x402. Ranks all 85 US ports of entry by all-in time - the d...24.8FuelScoutMachine-payable cheapest-fuel queries over x402. Station-level prices for Spain, France and Italy and offic...24.8RecallScoutMachine-payable US recall lookups over x402. Given a product, brand, ingredient or vehicle (make/model/year...24.8ScalpStream ResearchMachine-payable, impersonal research feeds over x402: ranked 0-30 DTE options candidates (/picks), dividend...24.8TensorFlow.js Social Media MCP ServerHosted MCP resource server offering 168 ML analytics tools invoked via POST, gated by the x402 payment prot...22.9Verse A2A AgentAgent2Agent surface declared by the card at https://api.verse-me.com/.well-known/agent.json (version 2.0.0,...18.6Verse Expertise APIThe REST paths the agent card names on api.verse-me.com, with no OpenAPI behind them: free reads GET /exper...18.6RedotPay Agentic Payments APIProduction RedotPay HTTP API surface behind the redotpay CLI and the redotpay-payment MCP server. Provides ...18.3APEX on X1 APIAgent-facing API of APEX on the X1 blockchain, served from apexfaucet.xyz: a remote MCP server at /api/mcp ...12.0

Companies reaching this through an API (2)

These companies publish an API, specification or operation carrying “x402” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Browser Use Cracked API

Score breakdown

Frequency
67.0
log-scaled weighted occurrences
Breadth
3.5
spread across providers
Quality lift
56.4
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

A2A 96 co-occurrences Micropayments 22 co-occurrences Agentic Payments 21 co-occurrences Agentic Commerce 49 co-occurrences Agent-Native 54 co-occurrences USDC 12 co-occurrences Stablecoins 22 co-occurrences pay-per-call 9 co-occurrences

Where this tag comes from

Provider tag128
Api tag156
Openapi tag5
Openapi op tag30

Cohort brief

Auto-generated

The 127 providers in the APIs.io catalog tagged x402, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
127
all scored
Mean Kin Score
45.9
+22.9 vs catalog 23
Mean Agent Readiness
38.3
+26.1 vs catalog 12.2
Spread
12–80.5
median 46.5 · σ 14.2
How the 127 split by band
Exemplar 13Strong 20Developing 58Thin 24Emerging 12Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 53.4 23.3 +30.1 127
Contract Quality 41.1 17.8 +23.3 127
Access Clarity 49.2 26.5 +22.7 127
Operational Transparency 33.9 13.8 +20.1 127
Discoverability 71.8 58 +13.8 127
Contract Governance 16.7 6.3 +10.4 127

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 83% 15% +68
MCP server (first-party) 83% 13% +70
Agent Skills 0% 0% 0
OAuth scopes 16% 12% +4
Security 99% 98% +1
Arazzo workflows 3% 2% +1
Governance rules 4% 13% -9

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Agoragentic 80.5
  2. 2 Hive Civilization 74.8
  3. 3 MandateShield 73.9
  4. 4 Delx 72.6
  5. 5 Drippay 72
  6. 6 0xArchive 71.6
  7. 7 Hilt 71.3
  8. 8 SCVD General Store 70.7
  9. 9 TaskHawk Systems 69.9
  10. 10 FeedOracle Technologies 69.1
Top by Agent Readiness
  1. 1 Agent Ready 72.9
  2. 2 Sirenic 70.9
  3. 3 AnyAPI 70.8
  4. 4 Ultravioleta DAO 69.1
  5. 5 FeedOracle Technologies 68.9
  6. 6 0xArchive 66.9
  7. 7 Kann KI das? Sponsoring Agent 66.6
  8. 8 Drippay 64.2
  9. 9 Hilt 63.9
  10. 10 Emboss 63.7
All 128 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 26 September 2026, across 27598 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This tag 
curl "https://apis.io/api/v1/tags/x402"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/x402"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/x402/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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