Circle signal
Circle Agent Stack
Circle frames Agent Stack as financial infrastructure for agents that can hold USDC, discover services, use Circle CLI/Skills, and pay for APIs, data, compute, and services without a human checkout flow.
v2.2.238-bellwether-commerce-safety / readiness-only-owned-surface
Map Circle Agent Stack's agent-wallet, service-discovery, and nanopayment story onto ApexScout's owned x402 paid API surfaces without changing payment rails, installing Circle tooling, submitting to a marketplace, or claiming Circle approval.
ApexScout fit: ApexScout is a seller-side paid API for buyer agents: agents can inspect metadata, hit an unpaid 402 challenge, and retry with buyer-controlled payment for one JSON response.
Boundary: ApexScout is not creating Circle Agent Wallets, running Circle CLI, installing Circle Skills, using Circle Gateway nanopayments, submitting to Circle Agent Marketplace, or claiming official Circle approval.
Circle signal
Circle frames Agent Stack as financial infrastructure for agents that can hold USDC, discover services, use Circle CLI/Skills, and pay for APIs, data, compute, and services without a human checkout flow.
Primary route
/api/agent-revenue-audit is the builder monetization route. Unpaid requests should return HTTP 402 JSON.
Production rail
Base mainnet x402 remains the active production rail. No Circle wallet, CLI, Skill, Gateway, marketplace, or settlement change is introduced here.
Readiness checklist
ready
/api/opportunity-check and /api/agent-revenue-audit are protected x402 routes.
ready
$0.01 first paid proof route and $5.00 Agent Revenue Audit route, each disclosed before payment.
ready
/mcp-tool-pack, /api/mcp-tool-pack, /.well-known/mcp.json, /docs.json, and /.well-known/agent.json.
ready
/payment-intent?route=agent-revenue-audit&src=circle-agent-stack-readiness
not-run
No Circle wallet, funding, or custody action was performed.
not-run
No Circle CLI command was run and no Circle Skill was installed.
not-enabled
Base mainnet x402 remains the only production payment rail.
owner-approval-required
No Circle marketplace submission was made in this pass.
Marketplace copy, owner-approved only
A USDC-payable x402 JSON audit for payment delivery verification, signed receipt verification, merchant assurance, and safer paid-route design.
ApexScout is an inbound-only, fixed-price pay-per-call trust and monetization intelligence API for buyer agents and builders. It exposes MCP-readable metadata, public proof pages, Base mainnet x402 payment gates, and a $5 Agent Revenue Audit for payment delivery verification, signed receipt verification, replay and resource binding, merchant assurance, and 402-to-paid correction planning.
Guardrails
Agent-readable JSON
{
"name": "ApexScout Circle Agent Stack Readiness",
"version": "v2.2.238-bellwether-commerce-safety",
"mode": "readiness-only-owned-surface",
"liveMode": "zero-contact-inbound-only",
"purpose": "Map Circle Agent Stack's agent-wallet, service-discovery, and nanopayment story onto ApexScout's owned x402 paid API surfaces without changing payment rails, installing Circle tooling, submitting to a marketplace, or claiming Circle approval.",
"observedSignal": {
"source": "Circle Agent Stack",
"home": "https://agents.circle.com/",
"announcement": "https://investor.circle.com/news/news-details/2026/Circle-Launches-AI-Infrastructure-to-Power-the-Agentic-Economy/default.aspx",
"nanopaymentsDocs": "https://developers.circle.com/gateway/nanopayments",
"explanatoryPost": "https://x.com/bleso_a/status/2053902145007849852",
"marketplace": "https://agents.circle.com/services",
"marketplaceCatalog": "https://agents.circle.com/api/v1/internal/x402/services",
"observedDate": "2026-08-18",
"observedPositioning": "Circle frames Agent Stack as financial infrastructure for agents that can hold USDC, discover services, use Circle CLI/Skills, and pay for APIs, data, compute, and services without a human checkout flow.",
"coreProblem": "Human checkout flows are a poor fit for autonomous software. Agents need a wallet, a price, and a payment protocol."
},
"apexScoutFit": {
"readyForCircleAgentStackStyleBuyers": true,
"role": "ApexScout is a seller-side paid API for buyer agents: agents can inspect metadata, hit an unpaid 402 challenge, and retry with buyer-controlled payment for one JSON response.",
"bestCurrentOffer": {
"label": "Agent Revenue Audit",
"page": "https://apexscout.ai/agent-revenue-audit",
"paymentIntent": "https://apexscout.ai/payment-intent?route=agent-revenue-audit&src=conversion-close",
"path": "/api/agent-revenue-audit",
"price": "$5.00",
"amountAtomicUnits": "5000000",
"network": "eip155:8453",
"expectedUnpaidStatus": 402,
"expectedPaidStatus": 200,
"paymentModel": "Pay once, get JSON once."
},
"firstPaidProof": {
"label": "Opportunity Check",
"path": "/api/opportunity-check",
"page": "https://apexscout.ai/first-paid-call?route=opportunity-check&src=conversion-close",
"price": "$0.01",
"amountAtomicUnits": "10000",
"network": "eip155:8453",
"expectedUnpaidStatus": 402,
"role": "Use this only when the buyer wants the cheapest payment proof before considering the $5 audit."
},
"marketplaceStory": "ApexScout can be described as a USDC-payable, pay-per-call trust and monetization intelligence API for agents and builders.",
"notRole": "ApexScout is not creating Circle Agent Wallets, running Circle CLI, installing Circle Skills, using Circle Gateway nanopayments, submitting to Circle Agent Marketplace, or claiming official Circle approval."
},
"compatibility": {
"paidApiForAgents": true,
"fixedPayPerCallPricingReady": true,
"usageBasedPricingReady": false,
"pricingModelNote": "ApexScout charges a fixed disclosed price per request; it is not metered usage billing.",
"agentReadableMetadataReady": true,
"mcpDiscoveryReady": true,
"x402PaymentReady": true,
"usdcSettlementReady": true,
"baseMainnetProductionRail": true,
"network": "eip155:8453",
"firstPaidRoute": "/api/opportunity-check",
"firstPaidRoutePrice": "$0.01",
"builderMonetizationRoute": "/api/agent-revenue-audit",
"builderMonetizationRoutePrice": "$5.00",
"circleAgentWalletCreatedByApexScout": false,
"circleCliInstalled": false,
"circleSkillsInstalled": false,
"circleGatewayNanopaymentsEnabled": false,
"circleMarketplaceSubmitted": false,
"circleWalletCustodyAdded": false,
"circleWalletFundingAdded": false,
"automaticBuyerSpendingAdded": false,
"officialCircleEndorsementClaimed": false,
"settlementRailChanged": false,
"sellerWalletChanged": false
},
"externalCatalogEvidence": {
"checkedAt": "2026-08-18",
"apexScoutFound": false,
"status": "not-listed-in-read-only-catalog-check",
"submissionMade": false,
"buyerDemandProven": false,
"note": "The compatibility packet is ready for owner review, but ApexScout was not found in the public Circle service catalog and no submission was made."
},
"ownedSurfaces": {
"page": "https://apexscout.ai/circle-agent-stack-readiness",
"api": "https://apexscout.ai/api/circle-agent-stack-readiness",
"mcpToolPack": "https://apexscout.ai/mcp-tool-pack",
"mcpToolPackApi": "https://apexscout.ai/api/mcp-tool-pack",
"mcpManifest": "https://apexscout.ai/.well-known/mcp.json",
"agentPaymentAlpha": "https://apexscout.ai/agent-payment-alpha",
"agentPaymentAlphaApi": "https://apexscout.ai/api/agent-payment-alpha",
"agentRevenueAudit": "https://apexscout.ai/agent-revenue-audit",
"agentRevenueAuditApi": "https://apexscout.ai/api/agent-revenue-audit",
"paymentIntent": "https://apexscout.ai/payment-intent?route=agent-revenue-audit&src=conversion-close",
"x402Proof": "https://apexscout.ai/x402-proof",
"buyerAgentChallenge": "https://apexscout.ai/buyer-agent-challenge",
"agentCoreGateway": "https://apexscout.ai/agentcore-gateway",
"agentCoreOpenApi": "https://apexscout.ai/api/agentcore-openapi.json",
"agentWonderlandReadiness": "https://apexscout.ai/agent-wonderland-readiness",
"docs": "https://apexscout.ai/docs.json",
"publicAgent": "https://apexscout.ai/public-agent",
"agentCard": "https://apexscout.ai/.well-known/agent.json",
"cashRegister": "https://apexscout.ai/api/cash-register"
},
"readinessChecklist": [
{
"item": "Paid API for agents",
"status": "ready",
"evidence": "/api/opportunity-check and /api/agent-revenue-audit are protected x402 routes."
},
{
"item": "Fixed pay-per-call pricing",
"status": "ready",
"evidence": "$0.01 first paid proof route and $5.00 Agent Revenue Audit route, each disclosed before payment."
},
{
"item": "Agent-readable discovery metadata",
"status": "ready",
"evidence": "/mcp-tool-pack, /api/mcp-tool-pack, /.well-known/mcp.json, /docs.json, and /.well-known/agent.json."
},
{
"item": "No-spend payment preview",
"status": "ready",
"evidence": "/payment-intent?route=agent-revenue-audit&src=circle-agent-stack-readiness"
},
{
"item": "Circle Agent Wallet setup",
"status": "not-run",
"evidence": "No Circle wallet, funding, or custody action was performed."
},
{
"item": "Circle CLI or Circle Skills setup",
"status": "not-run",
"evidence": "No Circle CLI command was run and no Circle Skill was installed."
},
{
"item": "Circle Gateway nanopayments",
"status": "not-enabled",
"evidence": "Base mainnet x402 remains the only production payment rail."
},
{
"item": "Circle Agent Marketplace submission",
"status": "owner-approval-required",
"evidence": "No Circle marketplace submission was made in this pass."
}
],
"marketplaceCopy": {
"headline": "ApexScout Agent Revenue Audit",
"shortDescription": "A USDC-payable x402 JSON audit for payment delivery verification, signed receipt verification, merchant assurance, and safer paid-route design.",
"longDescription": "ApexScout is an inbound-only, fixed-price pay-per-call trust and monetization intelligence API for buyer agents and builders. It exposes MCP-readable metadata, public proof pages, Base mainnet x402 payment gates, and a $5 Agent Revenue Audit for payment delivery verification, signed receipt verification, replay and resource binding, merchant assurance, and 402-to-paid correction planning.",
"primaryUrl": "https://apexscout.ai/agent-revenue-audit",
"proofUrl": "https://apexscout.ai/x402-proof",
"mcpUrl": "https://apexscout.ai/mcp-tool-pack",
"apiUrl": "https://apexscout.ai/api/agent-revenue-audit",
"category": "agent payments, x402, USDC, MCP, paid APIs, buyer-agent tools"
},
"buyerAgentPath": [
"https://apexscout.ai/circle-agent-stack-readiness",
"https://apexscout.ai/mcp-tool-pack",
"https://apexscout.ai/agent-payment-alpha",
"https://apexscout.ai/x402-proof",
"https://apexscout.ai/buyer-agent-challenge",
"https://apexscout.ai/payment-intent?route=agent-revenue-audit&src=circle-agent-stack-readiness",
"https://apexscout.ai/api/opportunity-check",
"https://apexscout.ai/api/agent-revenue-audit"
],
"guardrails": [
"Readiness-only owned surface.",
"Zero-contact and inbound-only.",
"No Circle Agent Wallet creation, funding, custody, or wallet management by ApexScout.",
"No Circle CLI command run and no Circle Skill installed.",
"No Circle Gateway nanopayment integration or settlement rail switch.",
"No Circle Agent Marketplace submission.",
"No official Circle endorsement, partnership, listing, or approval claim.",
"No paid calls or paid upstream calls.",
"No scraping, third-party discovery, endpoint scanning, or lead harvesting.",
"No posts, DMs, emails, manual messages, or contact campaigns.",
"No fake traffic, fake feedback, or fake paid completions.",
"No guaranteed revenue claim.",
"No buyer-level public data.",
"No settlement rail change.",
"No seller wallet change."
],
"privacy": {
"publicMetrics": "aggregate-only",
"buyerLevelDataPublic": false,
"buyerPromptsPublic": false,
"walletHistoriesPublic": false,
"paidResponsesPublic": false,
"rawFeedbackPublic": false,
"fullWalletAddressesPublic": false,
"fullPaymentPayloadsPublic": false
},
"ownerNextAction": "Use this refreshed packet for owner review of one Circle marketplace submission. Keep Circle CLI, wallets, Gateway nanopayments, and payment-rail work deferred until attributable buyer demand justifies them."
}