x402
Business capabilities this tag reaches
Subscription Billing & Revenue Management 1
Providers using this tag (124)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 12 Complete, well-documented, and agent-ready
Strong 25 Solid coverage with minor gaps
Developing 50 Usable, with meaningful gaps to close
Solvelaanchor-x402shveikAGENTUMWarpPay402 StudioGONNAHive Agent IQAmbrVaultfire ProtocolXGuardChainAware.aiPlyriumKann KI das? Sponsoring AgentGloriaMacaroon Network1F916Decision AnchorPictomancer.aiTrustBoost PII SanitizerFigmentCoin RailzHergert SynthoraAvalixAgent Health MonitorAgent ExchangeHookPulseingest0rServGhost Agent APIHyperbrowserSpongeVerified Digital Agents (VDA)PageAuditMerit SystemsSeshat MarketsPolicyCheck01MindMUJ428Phi LongevityAgent ZeroHostDeFiBerrerLiquid AgentMarz Greta-Lock NetworkLibertAIPaulieB14PoolPartyEditalMDTradeDataHub Public APIRadar CNPJBMC XIV
Thin 23 Limited public surface area
Emerging 14 Early or largely undocumented
APIs with this tag (86)
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 12 Complete, well-documented, and agent-ready
Telnyx X402 APIThe x402 API from Telnyx — 3 operation(s) for x402.Hive Civilization X402 APIThe X402 API from Hive Civilization — 18 operation(s) for x402.Hive MCP Gateway and RegistryProvider-operated remote MCP gateway on Render (named as the MCP transport by receipts.thehiveryiq.com/.wel...Delx X402 APIThe x402 API from Delx — 987 operation(s) for x402.Hilt 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...SCVD Evidence Agent (A2A)Agent2Agent protocol surface: an agent card served from https://scvd.store/.well-known/agent-card.json (and...SCVD General Store MCP ServersThree remote Model Context Protocol servers on the apex host, all Streamable HTTP and all answering initial...FeedOracle Technologies X402 APIThe x402 API from FeedOracle Technologies — 1 operation(s) for x402.Cracked API X402 APIThe X402 API from Cracked API — 1 operation(s) for x402.Browser Use X402 APIThe x402 API from Browser Use — 1 operation(s) for x402.Emboss A2A AgentAgent2Agent interface at https://api.getemboss.ai/a2a (JSON-RPC, A2A 1.0) discovered through a signed agent...AlgoVoi X402 APIThe x402 API from AlgoVoi — 2 operation(s) for x402.
Strong 25 Solid coverage with minor gaps
HumanMirror X402 APIThe X402 API from HumanMirror — 54 operation(s) for x402.Agent Ready X402 APIThe X402 API from Agent Ready — 1 operation(s) for x402.MadeOnSol x402 Robinhood Chain APIKeyless x402 pay-per-call subset of MadeOnSol for Robinhood Chain: 10 operations priced per call in USDG on...MadeOnSol x402 Solana APIKeyless x402 pay-per-call subset of MadeOnSol for Solana: 25 operations priced per call in USDC on Solana, ...MolTrust X402 APIThe X402 API from MolTrust — 2 operation(s) for x402.aicomglobal X402 APIThe X402 API from aicomglobal — 1 operation(s) for x402.ByKaranteli X402 APIPer-call priced history and depth endpoints, settled in USDC over the x402 protocol on Solana and Base main...MERCURY MCP ServerHosted Model Context Protocol server (serverInfo mercury-x402 1.0.0, protocolVersion 2025-06-18, streamable...MERCURY Web Fetch A2A AgentAgent-to-Agent (A2A 0.3.0) surface for "MERCURY Web Fetch", published as a conformant agent card at https:/...Pagesnap X402 APIKeyless USDC per-call paymentCouncil of AI GSPC MCP ServerRemote Model Context Protocol server at https://councilof.ai/mcp (Streamable HTTP, protocol 2025-06-18, ser...Council of AI X402 APIThe X402 API from Council of AI — 11 operation(s) for x402.GPT55 Model Gateway A2A AgentAgent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and iden...GPT55 x402 Gateway MCP ServerRemote Model Context Protocol server at https://gpt55.558686.xyz/mcp (Streamable HTTP; a GET returns the se...gpt55-token-gateway X402 APIThe x402 API from gpt55-token-gateway — 1 operation(s) for x402.Sirenic A2A AgentAgent2Agent JSON-RPC endpoint exposing the 116 paid routes as A2A skills (skill ids are the OpenAPI path te...Sirenic MCP ServerRemote Model Context Protocol server (streamable HTTP) over the same official French and European company-d...CONNSKILL Growth Services A2A AgentA2A merchant agent (protocolVersion 0.3.0, JSON-RPC at agent.connskill.com/a2a) whose card at /.well-known/...CONNSKILL Growth Services MCP ServerModel Context Protocol surface for the same catalogue: a hosted Streamable-HTTP endpoint at agent.connskill...LVL LTD Skill Market A2A AgentAgent2Agent surface: an Ed25519-JWS-signed agent card (protocolVersion 1.0.0, JSONRPC transport, version 1....Venice.ai X402 APIWallet-based API access using the x402 protocol. No API key required — authenticate with an EVM or Solana w...Monid x402 Run APIPay-per-run execution surface on x402.monid.ai — POST /v1/run answers HTTP 402 with an accepts[] array of C...APIMesh MCP Server@mbeato/apimesh-mcp-server (npm, v1.8.2, 2026-04-26; io.github.mbeato/apimesh in the official MCP registry)...2s A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://2s.io/.well-known/agent-card.json (pr...2s MCP ServerRemote Model Context Protocol server at https://2s.io/mcp (Streamable HTTP, POST only, protocol version 202...
Developing 25 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...Vaultfire Trust Service (x402)The priced projection of the same trust surface: 77 endpoints under /api/x402/* (29 priced GET reads, 46 pr...XGuard A2A AgentAgent2Agent surface: an agent card served identically from https://api.xguardgate.com/.well-known/agent-car...ChainAware 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...Gloria MCP ServerHosted, remote MCP server (Streamable HTTP at https://mcp.itsgloria.ai/mcp, serverInfo "Gloria AI" 1.26.0, ...Gloria X402 APIPay-per-request access to Gloria news over the x402 protocol with no account or API key: GET /news ($0.03),...Macaroon Network MCP ServerThe network router MCP server — a live Streamable HTTP endpoint at https://api.macaroonnetwork.com/mcp (ser...TrustBoost A2A AgentAgent2Agent surface: an agent card served from https://api.trustboost.dev/.well-known/agent-card.json (vers...Figment X402 APIThe x402 API from Figment — 5 operation(s) for x402.Autonoma A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://avalix.ai/.well-known/agent-card.json...Avalix X402 APIThe X402 API from Avalix — 2 operation(s) for x402.Agent Exchange MCP ServerRemote Model Context Protocol server at https://store.agentexchange.work/mcp (Streamable HTTP; a GET return...Agent Exchange X402 APIThe x402 API from Agent Exchange — 63 operation(s) for x402.The Agent Exchange Clearing HouseThe agent-to-agent task market at https://exchange.agentexchange.work: agents register a free reputation pa...Cook 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...Hyperbrowser Web APIStateless web utilities: fetch a single page, run a web search, or start a crawl. Includes `/x402` micropay...Hyperbrowser X402 APIThe X402 API from Hyperbrowser — 2 operation(s) for x402.PaidHandshake Exchange X402 APIThe X402 API from PaidHandshake Exchange — 3 operation(s) for x402.PolicyCheck x402 Analysis APIPay-per-request analysis over the x402 protocol: POST https://policycheck.tools/api/x402/analyze answers HT...01Mind A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://01mind.net/.well-known/agent-card.jso...Phi Longevity PRISM MCP ServerOfficial Model Context Protocol server for the PRISM biomarker-analysis engine. Hosted Streamable HTTP at h...Agent Zero A2A AgentAgent2Agent surface: an agent card served from https://onchainagentintel.io/.well-known/agent-card.json (mi...BerrerGate A2A AgentAgent2Agent surface: an agent card served from https://api.berrergate.com/.well-known/agent-card.json (cont...WarpPay402 MCP ServerHosted MCP server at https://api.warppay402.com/mcp exposing the same 19 tools as the REST API (public_data...LEGIT A2A Agent CardAgent card served from https://legit.gonna.bond/.well-known/agent.json and, byte-identical, from the canoni...
Thin 13 Limited public surface area
Agent Verification Utility A2A AgentAgent2Agent (A2A) 1.0 surface: an agent card served from https://agent-economy.kgninja.dev/.well-known/agen...Agent Verification Utility MCP ServerRemote Model Context Protocol server at https://agent-economy.kgninja.dev/mcp — stateless Streamable HTTP, ...AIScan A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://getaiscan.app/.well-known/agent-card....Qorevia Universal Agent Gateway (MCP + A2A)The free discovery and routing layer in front of the paid tools, served from the same origin. MCP: https://..._done CatalogSingle-page agent-native catalog of the 27 _done pay-per-call utility APIs. Publishes a real llms.txt, a ro...Quietforge x402 Service Index APIA searchable, health-probed index of live x402 pay-per-call endpoints re-crawled from the Coinbase CDP and ...crvUSD Yield Optimizer A2A AgentAgent2Agent surface of the same service: an agent card at https://llama.box/yo/.well-known/agent.json (prot...Artem / A2A Sandbox X402 APIThe X402 API from Artem / A2A Sandbox — 1 operation(s) for x402.Sandbox Contractor Agent (A2A)Agent2Agent protocol surface: an agent card served from https://a2a.elonsusk.com/.well-known/agent-card.jso...Horse Truth X402 APIThe X402 API from Horse Truth — 1 operation(s) for x402.onchain-risk-oracle A2A AgentAgent2Agent (A2A) protocol surface: an agent card at https://oracle.evebrief.org/.well-known/agent-card.jso...X402 AI 自助门店 x402 Facilitator APIA self-hosted x402 facilitator role on the same host - POST /facilitator/verify and POST /facilitator/settl...Who Represents This Address (RJH Signal Technologies) X402 APIThe X402 API from Who Represents This Address (RJH Signal Technologies) — 1 operation(s) for x402.
Emerging 11 Early or largely undocumented
GanjaMon AI A2A AgentAgent2Agent (A2A) protocol surface: an agent card served from https://grokandmon.com/.well-known/agent-card...Grok & Mon REST APIThe JSON REST origin under https://grokandmon.com/api/ that the website, the MCP tools and the ACP endpoint...AirScoutMachine-payable air-quality queries over x402 with global coverage: current US AQI and pollutant breakdown ...BorderScoutMachine-payable US border-crossing queries over x402. Ranks all 85 US ports of entry by all-in time - the d...FuelScoutMachine-payable cheapest-fuel queries over x402. Station-level prices for Spain, France and Italy and offic...RecallScoutMachine-payable US recall lookups over x402. Given a product, brand, ingredient or vehicle (make/model/year...ScalpStream ResearchMachine-payable, impersonal research feeds over x402: ranked 0-30 DTE options candidates (/picks), dividend...Verse A2A AgentAgent2Agent surface declared by the card at https://api.verse-me.com/.well-known/agent.json (version 2.0.0,...Verse Expertise APIThe REST paths the agent card names on api.verse-me.com, with no OpenAPI behind them: free reads GET /exper...RedotPay Agentic Payments APIProduction RedotPay HTTP API surface behind the redotpay CLI and the redotpay-payment MCP server. Provides ...APEX on X1 APIAgent-facing API of APEX on the X1 blockchain, served from apexfaucet.xyz: a remote MCP server at /api/mcp ...
Companies reaching this through an API (8)
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
Horse Truth
MadeOnSol
Monid
PaidHandshake Exchange
Telnyx
Who Represents This Address (RJH Signal Technologies)
Score breakdown
Frequency
64.2
log-scaled weighted occurrences
Breadth
2.9
spread across providers
Quality lift
50.6
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor
Related tags
A2A Verified 78 co-occurrences
A2A 93 co-occurrences
x402 Verified 21 co-occurrences
Micropayments 20 co-occurrences
Agentic Payments 18 co-occurrences
Agentic Commerce 47 co-occurrences
Trust 15 co-occurrences
Where this tag comes from
Provider tag132
Api tag85
Openapi tag18
Openapi op tag66
Markets provisional
Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.
| Market | Share of the market's providers |
|---|---|
| AI Agents (A2A agent cards) | 23% |
Cohort brief
Auto-generatedThe 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
46.6
+23.7 vs catalog 22.9
Mean Agent Readiness
38.3
+26.4 vs catalog 11.9
Spread
12–79.8
median 46.6 · σ 14.4
How the 127 split by band
Exemplar 12Strong 26Developing 53Thin 23Emerging 13Minimal 0
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Developer Ergonomics | 53.5 | 23.2 | +30.3 | 127 |
| Contract Quality | 42.9 | 17.6 | +25.3 | 127 |
| Access Clarity | 49.4 | 26.5 | +22.9 | 127 |
| Operational Transparency | 34.3 | 13.7 | +20.6 | 127 |
| Discoverability | 72.4 | 58.1 | +14.3 | 127 |
| Contract Governance | 17.3 | 6.3 | +11 | 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
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 83% | 14% | +69 |
| MCP server (first-party) | 83% | 12% | +71 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 16% | 11% | +5 |
| Security | 99% | 98% | +1 |
| Arazzo workflows | 3% | 2% | +1 |
| Governance rules | 5% | 14% | -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 Agoragentic 79.8
- 2 MandateShield 74.2
- 3 Hive Civilization 74.1
- 4 Delx 72.5
- 5 Hilt 72.4
- 6 Drippay 72
- 7 0xArchive 71.6
- 8 SCVD General Store 71.6
- 9 FeedOracle Technologies 69.5
- 10 TaskHawk Systems 69.4
Top by Agent Readiness
- 1 Agent Ready 72.9
- 2 Sirenic 70.9
- 3 AnyAPI 70.8
- 4 Ultravioleta DAO 69.1
- 5 0xArchive 66.9
- 6 Kann KI das? Sponsoring Agent 66.6
- 7 SCVD General Store 65.7
- 8 Drippay 64.2
- 9 Emboss 63.7
- 10 FeedOracle Technologies 62.8
All 127 members of this roster resolve to a scored provider in
the catalog.
Coverage caveat. 94 of 127 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 5 October 2026, across 29093 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.
Coverage caveat. 94 of 127 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 5 October 2026, across 29093 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.