{"artifact":{"apiPath":"/api/reports/stablecoin-rails-for-agents-2026/evidence","byteLength":5181,"description":"Structured evidence ledger tying claims and chart provenance back to cited sources.","format":"evidence","label":"Evidence artifact","mimeType":"application/json; charset=utf-8","priceUsdc":0,"sha256":"4fa60c5017dd737c1b1f1374a96ff88c58188fce93670bee04f690c6571610b5","status":"live"},"document":{"chartProvenance":[{"chartTitle":"Stablecoin market capitalization moved above $300B entering 2026","sourceLabels":["Stablecoin Insider 2026 trends","Circle USDC"],"sourceUrls":["https://stablecoininsider.org/stablecoin-trends-in-2026/","https://www.circle.com/usdc"],"whyUseful":"Anchors the report's architecture discussion in a market that is already large enough to justify enterprise-grade controls and treasury design."},{"chartTitle":"B2B now dominates measured stablecoin payment volume","sourceLabels":["FinTech Futures stablecoin volumes"],"sourceUrls":["https://www.fintechfutures.com/blockchain-crypto-digital-assets/is-2026-a-make-or-break-year-for-stablecoins"],"whyUseful":"Explains why the report emphasizes approvals, treasury rails, and compliance surfaces instead of only consumer-wallet ergonomics."}],"claims":[{"chartTitles":[],"confidence":"high","id":"five-layer-stack","kind":"comparison","section":"Layer model","sourceLabels":["Tempo Mainnet launch","Stripe machine payments","Crossmint regulated transfers"],"sourceUrls":["https://tempo.xyz/blog/mainnet","https://docs.stripe.com/payments/machine","https://crossmint.mintlify.app/stablecoin-orchestration/regulated-transfers/quickstart"],"statement":"No single vendor covers funding, custody, payment negotiation, settlement, and compliance end to end, so operators still compose the stack layer by layer."},{"chartTitles":[],"confidence":"high","id":"x402-stateless-best-fit","kind":"finding","section":"Payment negotiation","sourceLabels":["Welcome to x402","Stripe machine payments"],"sourceUrls":["https://docs.cdp.coinbase.com/x402/welcome","https://docs.stripe.com/payments/machine"],"statement":"x402 remains the clearest stateless request-pay-retry protocol for paid APIs and tool calls."},{"chartTitles":[],"confidence":"high","id":"mpp-session-fit","kind":"comparison","section":"Settlement and retries","sourceLabels":["Tempo Mainnet launch","Stripe machine payments"],"sourceUrls":["https://tempo.xyz/blog/mainnet","https://docs.stripe.com/payments/machine"],"statement":"MPP is the stronger fit for repeated or session-based machine payments because it extends negotiation with reusable payment sessions and broader funding options."},{"chartTitles":[],"confidence":"high","id":"custody-surface-differences","kind":"comparison","section":"Custody and identity","sourceLabels":["Privy wallet overview","Turnkey embedded wallet guide","Fireblocks custody overview"],"sourceUrls":["https://docs.privy.io/wallets/overview","https://docs.turnkey.com/production-checklist/embedded-wallet","https://developers.fireblocks.com/docs/overview"],"statement":"Embedded wallet and MPC vendors differ materially in custody and policy surfaces, making wallet choice an operator-control decision rather than a cosmetic integration choice."},{"chartTitles":["Stablecoin market capitalization moved above $300B entering 2026"],"confidence":"medium","id":"stablecoin-market-scale","kind":"market","section":"Market scale","sourceLabels":["Stablecoin Insider 2026 trends","Circle USDC"],"sourceUrls":["https://stablecoininsider.org/stablecoin-trends-in-2026/","https://www.circle.com/usdc"],"statement":"Public reporting placed stablecoin market capitalization above $300 billion entering 2026, making the report's architectural choices live market decisions rather than speculative design."},{"chartTitles":["B2B now dominates measured stablecoin payment volume"],"confidence":"medium","id":"b2b-volume-dominance","kind":"chart","section":"Enterprise controls","sourceLabels":["FinTech Futures stablecoin volumes"],"sourceUrls":["https://www.fintechfutures.com/blockchain-crypto-digital-assets/is-2026-a-make-or-break-year-for-stablecoins"],"statement":"B2B stablecoin payment volume now dominates measured flows, which explains why treasury movement, approvals, and compliance controls matter more than consumer wallet UX alone."}],"generatedAt":"2026-03-22T00:00:00.000Z","slug":"stablecoin-rails-for-agents-2026","summary":{"chartBackedClaimCount":2,"claimCount":6,"ecosystemSourceCount":2,"officialSourceCount":9,"totalSourceCount":11},"title":"Stablecoin Rails for Agents, 2026"},"generatedAt":"2026-05-04T00:16:30.219Z","kind":"deep_report_evidence","operatorAccess":null,"payer":null}