{ "data": { "a": { "slug": "circle-gateway-nanopayments", "name": "Circle Gateway Nanopayments", "vendor": "Circle", "vendorUrl": "https://www.circle.com", "kind": "http-api", "category": "payment-platforms", "summary": "Circle Gateway Nanopayments is a hosted x402 facilitator that settles gas-free USDC payments as small as $0.000001. Buyers sign offchain authorisations against a Gateway balance, and Circle settles net positions onchain in batches.", "url": "https://www.anchorterminal.com/tools/circle-gateway-nanopayments", "markdownUrl": "https://www.anchorterminal.com/tools/circle-gateway-nanopayments.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/circle-gateway-nanopayments.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/circle-gateway-nanopayments.json", "repo": "https://github.com/circlefin/evm-gateway-contracts", "license": "Proprietary hosted service under the Circle Developer Terms. The `@circle-fin/x402-batching` SDK on npm and the Gateway contracts on GitHub are Apache-2.0", "transports": [ "http" ], "remoteUrl": "https://gateway-api.circle.com", "packages": [ { "registry": "npm", "name": "@circle-fin/x402-batching" } ], "auth": "none", "authNotes": "No API key or account on the self-managed route. A buyer signs each payment as an EIP-3009 `TransferWithAuthorization` with an EOA private key, and a seller supplies only a receiving address. The SDK's facilitator client sends no credential by default and accepts optional headers. The OpenAPI file defines a Bearer key scheme and applies it to no operation. The Circle Wallets route in the buyer quickstart needs a Circle Console account, an API key and an entity secret. Smart contract accounts are not supported.", "pricing": "usage", "pricingNotes": "No per-payment fee or gas for a nanopayment, per the docs. The buyer pays chain gas once for the deposit. Crosschain withdrawals carry a 0.005% transfer fee plus a gas fee by source chain, from $0.001 to $1.00, and same-chain withdrawals carry no transfer fee. Testnets work with faucet USDC and no account. No subscription or card. The developer terms say Gateway fees are communicated through the API and may change (checked 2026-10-09).", "priceSummary": "0.01% fee", "where": "hosted", "x402": { "level": "partial", "evidence": "Circle runs the facilitator. Sellers using `createGatewayMiddleware` or `BatchFacilitatorClient` answer `402 Payment Required` with a `PAYMENT-REQUIRED` header and settle through `POST /v1/x402/settle` on gateway-api.circle.com, under the x402 `exact` scheme with `extra.name` set to `GatewayWalletBatched`. Circle's own API is not paid over x402 (https://developers.circle.com/gateway-nanopayments; https://developers.circle.com/openapi/gateway-nanopayments.yaml, checked 2026-10-09).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": 16895, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://developers.circle.com/gateway-nanopayments", "llmsTxt": "https://developers.circle.com/llms.txt", "openapi": "https://developers.circle.com/openapi/gateway-nanopayments.yaml", "capabilities": [ "payments.x402", "payments.stablecoin" ], "tags": [ "hosted", "usage-based", "x402", "facilitator", "stablecoins", "usdc", "micropayments", "batched-settlement", "non-custodial", "keyless", "openapi", "llms-txt", "typescript", "open-source-sdk" ], "lastRelease": "2026-09-16", "graded": true, "anchor": { "graded": true, "score": 67.6, "grade": "B", "agentReady": false, "rank": 247, "ranked": true, "rankOf": 950, "categoryRank": 5, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 75, "maintenance": 77, "payments": 80, "reliability": 56, "schema": 80, "security": 64, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": -3, "negativeNotes": [ "26 August 2026. `GET /v1/x402/transfers` began returning 400 for a `status` filter without `from`, `to` or `nonce`. Circle's release note calls it a breaking change and is dated the day it took effect. No earlier notice was found in the release notes (https://developers.circle.com/release-notes/gateway-2026). Documented, so the smallest deduction." ], "verdict": "A buyer with an EOA key and a seller with a wallet address can transact with no account or API key, and the settle call returns 16 documented error codes with recovery steps. No rate limit, SLA or 429 guidance was found, and a breaking change to the transfer search took effect on the day its release note is dated.", "bestFor": "Sellers charging fractions of a cent per API call and agents making many small payments from one prefunded balance on EVM chains.", "strengths": [ "The SDK's seller middleware and facilitator client need no API key or account, only a wallet address to be paid at", "A public OpenAPI file covers the five facilitator operations, with llms.txt and a Markdown twin of every docs page", "The error reference lists 16 settle and verify codes, each with a cause and a recovery step", "The batching contracts were audited by OtterSec (report dated 10 June 2026), and the Gateway contracts are Apache-2.0 on GitHub", "Deposits sit in a non-custodial contract, with a withdrawal path that needs no Circle API after a 7-day delay" ], "weaknesses": [ "No rate limit, 429 guidance or SLA was found for the Gateway API in the reviewed documentation", "From 26 August 2026 a `status` filter alone on `GET /v1/x402/transfers` returns 400. The release note is dated the same day", "Only EOA signatures work. Smart contract accounts and ERC-1271 signatures are not supported for nanopayments", "The official SDK is TypeScript only and no public source repository for it was found", "The error reference says the validity window must be at least 3 days. The seller quickstart and the SDK source say 7 days", "The developer terms let Circle change or discontinue Gateway without prior notice and change its fees at its discretion" ], "agentNotes": [ "Deposit on the chain you will pay from. `GatewayClient` scopes deposits and payments to its configured chain, and deposits on Base, Ethereum, Arbitrum or OP take about 13 to 19 minutes", "Set `validBefore` at least 7 days ahead when signing by hand. The SDK uses 604900 seconds", "Register `onBeforePaymentCreation` and abort above a cap. `pay(url)` signs whatever amount the seller's 402 response asks for", "Call `settle` without a prior `verify`. Balance and nonce checks happen only at settle time", "Pass `from`, `to` or `nonce` whenever you filter transfers by `status`, and wait for `completed` before a dependent onchain step" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 67.6 } ], "editorialScores": { "ergonomics": 75, "maintenance": 77, "payments": 80, "reliability": 56, "schema": 80, "security": 64, "transparency": 59 }, "provenanceScore": 84 }, "connect": { "install": "npm install @circle-fin/x402-batching" }, "letme": { "capability": "https://letme.dev/payments.x402", "tool": "https://letme.dev/circle-gateway-nanopayments" }, "sameCompany": [ "circle-wallets" ], "area": "payments", "unitPrices": [ { "item": "Batched nanopayment", "unit": "tx", "usd": 0, "note": "no per-payment fee or gas for buyer or seller, per the docs. The deposit costs chain gas once" }, { "item": "Crosschain withdrawal transfer fee", "unit": "pct", "usd": 0.005, "note": "0.5 basis points. Not charged on same-chain withdrawals" }, { "item": "Gateway gas fee, Base as source chain", "unit": "tx", "usd": 0.01, "note": "by source chain, from $0.001 on Sei and Unichain to $1.00 on Ethereum" }, { "item": "Forwarding Service fee", "unit": "tx", "usd": 0.05, "note": "optional, plus a forwarding gas fee" } ], "provenance": { "legalEntity": "Circle Technology Services, LLC", "domain": "circle.com", "domainRegistered": "1999-04-09", "endpointOnVendorDomain": true, "terms": "https://console.circle.com/legal/developer-terms", "privacy": "https://www.circle.com/legal/privacy-policy", "statusPage": "https://status.circle.com", "changelog": "https://developers.circle.com/release-notes/gateway-2026", "securityTxt": "none", "checked": "2026-10-09", "notes": [ "The Developer Terms of Service (last updated 16 September 2026) are a contract with Circle Technology Services, LLC and name Gateway as a Permissionless Product. They say committed USDC stays the user's property and that Circle may modify or discontinue Permissionless Products without prior notice.", "The Privacy Policy (last updated 16 September 2026) is from Circle Internet Group, Inc. and its subsidiaries and links a sub-processor list last updated 22 December 2025.", "The API hosts are gateway-api.circle.com and gateway-api-testnet.circle.com, on the vendor's domain.", "status.circle.com is an Atlassian Statuspage with Circle Gateway components for each chain. It has no component named for nanopayments or x402.", "www.circle.com/.well-known/security.txt answered 404. The SECURITY.md in github.com/circlefin/skills names a bug bounty programme at hackerone.com/circle-bbp.", "RDAP for circle.com gives a registration date of 1999-04-09." ], "score": 84 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/circle-gateway-nanopayments.json", "live": { "slug": "circle-gateway-nanopayments", "probe": { "target": "https://gateway-api.circle.com", "method": "get", "lastAt": "2026-10-10T02:54:50.922122134Z", "lastOk": true, "lastStatus": 404, "lastMs": 152, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 147, "p95ms24h": 1147, "samples24h": 115, "samples30d": 115, "days": [ { "date": "2026-10-09", "probes": 85, "ok": 85 }, { "date": "2026-10-10", "probes": 30, "ok": 30 } ] }, "vendorStatus": { "page": "https://status.circle.com", "indicator": "major", "summary": "Partial System Outage", "checkedAt": "2026-10-10T02:49:58.631998243Z" }, "versions": [ { "registry": "npm", "name": "@circle-fin/x402-batching", "version": "3.5.0", "seenAt": "2026-10-09T16:45:07.952774661Z" } ], "githubStars": 10, "npmWeekly": 16895, "pages": [ { "url": "https://developers.circle.com/release-notes/gateway-2026", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:35:33.753415397Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "6ef7c495e029" }, { "url": "https://www.circle.com/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:49:03.821925211Z", "changedAt": "2026-10-09T18:49:03.821925211Z", "fingerprint": "0b638ffd6762" }, { "url": "https://console.circle.com/legal/developer-terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:34:17.88745813Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "06bed5753aaf" } ], "updatedAt": "2026-10-10T02:54:50.922122134Z" } }, "answer": "Circle Gateway Nanopayments and Crossmint API + Docs MCP score within a point of each other on agent readiness, 67.6 (B) and 67.1 (B). Crossmint API + Docs MCP leads on security \u0026 auth, maintenance \u0026 community and transparency \u0026 trust.", "b": { "slug": "crossmint", "name": "Crossmint API + Docs MCP", "vendor": "Crossmint", "vendorUrl": "https://www.crossmint.com", "kind": "http-api", "category": "payment-platforms", "summary": "Wallet, checkout and stablecoin infrastructure with an agent product line.", "url": "https://www.anchorterminal.com/tools/crossmint", "markdownUrl": "https://www.anchorterminal.com/tools/crossmint.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/crossmint.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/crossmint.json", "repo": "https://github.com/Crossmint/crossmint-sdk", "license": "Apache-2.0", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://www.crossmint.com/api", "packages": [ { "registry": "npm", "name": "@crossmint/wallets-sdk" }, { "registry": "npm", "name": "@crossmint/client-sdk-react-ui" } ], "auth": "api-key", "authNotes": "Server-side and client-side API keys in the X-API-KEY header, each with scopes; client keys can require JWTs from your own auth provider. Staging keys work on testnets at staging.crossmint.com and production keys on mainnets. The docs MCP server needs no auth.", "pricing": "freemium", "pricingNotes": "Wallets free for 1,000 monthly active wallets and up to 2,000 transactions, then from $0.02 per monthly active wallet with volume discounts. Tokenisation from $0.01 an action. Onramp, offramp, checkout and stablecoin orchestration are per-transaction fees with volume discounts, not published. Agent Cards and Agent Checkouts pricing isn't published. Enterprise (premium SLAs and rate limits) is through sales (https://www.crossmint.com/pricing).", "priceSummary": "$0.02 / mo", "where": "hosted", "x402": { "level": "partial", "evidence": "Agent Wallets pay x402 and MPP endpoints, and an n8n node puts an x402 paywall in front of workflows. The Crossmint API itself isn't paid over x402 (https://docs.crossmint.com/agents/payment-flows/x402).", "endpoints": [] }, "toolCount": 1, "popularity": { "githubStars": 52, "npmWeekly": 39991, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.crossmint.com/agents/overview", "llmsTxt": "https://docs.crossmint.com/llms.txt", "openapi": "https://raw.githubusercontent.com/Crossmint/crossmint-sdk/main/packages/wallets/src/openapi.json", "capabilities": [ "payments.card", "payments.x402", "payments.stablecoin", "payments.checkout", "payments.payouts" ], "tags": [ "hosted", "freemium", "mcp", "llms-txt", "stablecoin", "x402", "wallet", "typescript", "webhooks" ], "lastRelease": "2026-10-01", "graded": true, "anchor": { "graded": true, "score": 67.1, "grade": "B", "agentReady": false, "rank": 260, "ranked": true, "rankOf": 950, "categoryRank": 6, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 71, "maintenance": 85, "payments": 50, "reliability": 53, "schema": 71, "security": 73, "transparency": 80 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Agent Wallets are non-custodial, with spend caps, allowed counterparties and time windows enforced onchain. No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts.", "bestFor": "Products that let agents spend, especially where a user wants a capped card or a capped stablecoin wallet for an agent, or an agent that buys from ordinary merchant sites.", "strengths": [ "Agent Wallets are non-custodial, with spend caps, allowed counterparties and time windows enforced onchain", "Scoped server and client API keys, with each operation's required scope named in the spec", "Idempotency keys on transaction and transfer creation, and cursor or page pagination with date filters", "Regulatory footprint stated in public, a Spanish CNMV crypto-asset service provider authorisation plus FinCEN and FINTRAC registrations", "16 SDK release commits since 1 July, the latest on 1 October 2026" ], "weaknesses": [ "No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts", "Agent Checkouts runs in production only, so the first test spends real money", "Status history is on a JavaScript-only Datadog page, and the docs changelog stops at 11 February 2026", "No MCP server for wallets or payments, only a one-tool docs search", "SDKs in TypeScript only" ], "agentNotes": [ "Send an `x-idempotency-key` on every transaction or transfer create so a retry can't pay twice", "Use staging keys against testnets; production keys work on mainnets only, and Agent Checkouts has no staging at all", "On 429, wait and retry. No Retry-After header is documented, and writes are capped at 120 a minute per project", "Use Agent Wallets for x402 and MPP endpoints and Agent Cards for card merchants; they aren't interchangeable", "Append `.md` to any docs URL for a Markdown copy" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 67.1 } ], "editorialScores": { "ergonomics": 71, "maintenance": 85, "payments": 50, "reliability": 53, "schema": 71, "security": 73, "transparency": 65 }, "provenanceScore": 95 }, "connect": { "http": "curl -X POST https://staging.crossmint.com/api/2025-06-09/wallets -H \"X-API-KEY: $CROSSMINT_API_KEY\" \\\n -H \"Content-Type: application/json\" -d '{\"chainType\":\"evm\"}'", "claudeCode": "claude mcp add --transport http crossmint-docs https://docs.crossmint.com/mcp", "config": { "mcpServers": { "crossmint-docs": { "url": "https://docs.crossmint.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/payments.card", "tool": "https://letme.dev/crossmint" }, "area": "payments", "unitPrices": [ { "item": "Wallet over free tier", "unit": "month", "usd": 0.02, "note": "per monthly active wallet above 1,000, volume discounts" }, { "item": "Tokenisation action", "unit": "call", "usd": 0.01, "note": "starting price, volume discounts" } ], "provenance": { "legalEntity": "Crossmint, Inc.", "domain": "crossmint.com", "domainRegistered": "2007-02-23", "domainNote": "crossmint.com was registered in 2007, long before Crossmint was founded. Terms also name Crossmint Europe, S.L. and Crossmint Horizon, Inc. The security.txt lists a contact and policy but no Expires field.", "endpointOnVendorDomain": true, "terms": "https://www.crossmint.com/legal/terms-of-service", "privacy": "https://www.crossmint.com/legal/privacy-policy", "statusPage": "https://status.crossmint.com", "changelog": "https://docs.crossmint.com/changelog", "securityTxt": "valid", "checked": "2026-09-30", "score": 95 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/crossmint.json", "live": { "slug": "crossmint", "probe": { "target": "https://www.crossmint.com/api", "method": "get", "lastAt": "2026-10-10T02:54:51.995728001Z", "lastOk": true, "lastStatus": 404, "lastMs": 744, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 190, "p95ms24h": 947, "samples24h": 249, "samples30d": 2466, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 30, "ok": 30 } ] }, "vendorStatus": { "page": "https://status.crossmint.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-10T00:50:23.763107543Z" }, "versions": [ { "registry": "npm", "name": "@crossmint/client-sdk-react-ui", "version": "4.9.1", "seenAt": "2026-10-09T16:48:02.937817598Z" }, { "registry": "npm", "name": "@crossmint/wallets-sdk", "version": "1.20.0", "seenAt": "2026-10-09T16:48:02.042314638Z" } ], "githubStars": 52, "npmWeekly": 41954, "securityTxt": { "url": "https://crossmint.com/.well-known/security.txt", "state": "valid", "checkedAt": "2026-10-09T15:40:16.859997151Z" }, "llmsTxt": { "url": "https://docs.crossmint.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-09T14:01:46.52402267Z" }, "domain": { "domain": "crossmint.com", "registered": "2007-02-23", "source": "https://rdap.verisign.com/com/v1/domain/crossmint.com", "checkedAt": "2026-10-04T13:07:50.738904164Z" }, "pages": [ { "url": "https://docs.crossmint.com/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:37:05.527461493Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "9586f8e8a1d3" }, { "url": "https://www.crossmint.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:49:26.734830906Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "dffec4faf7a5" }, { "url": "https://www.crossmint.com/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:49:21.855402721Z", "changedAt": "2026-10-02T15:26:08.112583044Z", "fingerprint": "73ab07afabce" }, { "url": "https://www.crossmint.com/legal/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:49:24.219347989Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "869ee89b903b" } ], "updatedAt": "2026-10-10T02:54:51.995728001Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Circle", "b": "Crossmint", "name": "Vendor" }, { "a": "https://gateway-api.circle.com", "b": "https://www.crossmint.com/api", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "None", "b": "API key", "name": "Auth" }, { "a": "Pay per use", "b": "Freemium", "name": "Pricing" }, { "a": "payer tooling only", "b": "payer tooling only", "name": "x402" }, { "a": "Proprietary hosted service under the Circle Developer Terms. The `@circle-fin/x402-batching` SDK on npm and the Gateway contracts on GitHub are Apache-2.0", "b": "Apache-2.0", "name": "Licence" }, { "a": "none", "b": "1", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-09-16", "b": "2026-10-01", "name": "Last release" }, { "a": "2026-09-16", "b": "2026-07-01", "name": "Terms last updated" }, { "a": "no date given", "b": "2026-09-21", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "yes", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "17k npm/wk", "b": "52 stars, 40k npm/wk", "name": "Popularity" }, { "a": "none", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Circle Gateway Nanopayments and Crossmint API + Docs MCP score within a point of each other on agent readiness, 67.6 (B) and 67.1 (B). Crossmint API + Docs MCP leads on security \u0026 auth, maintenance \u0026 community and transparency \u0026 trust.", "question": "Which is better for AI agents, Circle Gateway Nanopayments or Crossmint API + Docs MCP?" }, { "answer": "Circle Gateway Nanopayments needs no key. Crossmint API + Docs MCP needs an API key.", "question": "Do Circle Gateway Nanopayments and Crossmint API + Docs MCP need an API key?" }, { "answer": "Yes. Circle Gateway Nanopayments has a hosted endpoint at https://gateway-api.circle.com and Crossmint API + Docs MCP at https://www.crossmint.com/api.", "question": "Can an agent call Circle Gateway Nanopayments and Crossmint API + Docs MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 80 against 71", "Payments \u0026 pricing, 80 against 50" ], "also": [ "No key needed to call it" ], "goodFor": "Sellers charging fractions of a cent per API call and agents making many small payments from one prefunded balance on EVM chains.", "slug": "circle-gateway-nanopayments", "watchFor": "No rate limit, 429 guidance or SLA was found for the Gateway API in the reviewed documentation" }, { "aheadOn": [ "Security \u0026 auth, 73 against 64", "Maintenance \u0026 community, 85 against 77", "Transparency \u0026 trust, 80 against 72" ], "also": [ "No incidents deducted, where Circle Gateway Nanopayments loses 3 points for them" ], "goodFor": "Products that let agents spend, especially where a user wants a capped card or a capped stablecoin wallet for an agent, or an agent that buys from ordinary merchant sites.", "slug": "crossmint", "watchFor": "No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts" } ], "job": { "capability": "payments.x402", "name": "x402 payments" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agentcard-vs-crossmint.json", "title": "Agentcard vs Crossmint API + Docs MCP", "url": "https://www.anchorterminal.com/compare/agentcard-vs-crossmint" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-lago.json", "title": "Crossmint API + Docs MCP vs Lago", "url": "https://www.anchorterminal.com/compare/crossmint-vs-lago" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-nevermined.json", "title": "Crossmint API + Docs MCP vs Nevermined API + MCP", "url": "https://www.anchorterminal.com/compare/crossmint-vs-nevermined" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-orb.json", "title": "Crossmint API + Docs MCP vs Orb", "url": "https://www.anchorterminal.com/compare/crossmint-vs-orb" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-paid.json", "title": "Crossmint API + Docs MCP vs Paid", "url": "https://www.anchorterminal.com/compare/crossmint-vs-paid" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-payman.json", "title": "Crossmint API + Docs MCP vs Payman Genie MCP", "url": "https://www.anchorterminal.com/compare/crossmint-vs-payman" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-skyfire.json", "title": "Crossmint API + Docs MCP vs Skyfire API + MCP", "url": "https://www.anchorterminal.com/compare/crossmint-vs-skyfire" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-stripe-mcp.json", "title": "Crossmint API + Docs MCP vs Stripe API + MCP", "url": "https://www.anchorterminal.com/compare/crossmint-vs-stripe-mcp" }, { "json": "https://www.anchorterminal.com/compare/atxp-vs-circle-gateway-nanopayments.json", "title": "ATXP vs Circle Gateway Nanopayments", "url": "https://www.anchorterminal.com/compare/atxp-vs-circle-gateway-nanopayments" }, { "json": "https://www.anchorterminal.com/compare/atxp-vs-crossmint.json", "title": "ATXP vs Crossmint API + Docs MCP", "url": "https://www.anchorterminal.com/compare/atxp-vs-crossmint" }, { "json": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-skyfire.json", "title": "Circle Gateway Nanopayments vs Skyfire API + MCP", "url": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-skyfire" }, { "json": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-tempo.json", "title": "Circle Gateway Nanopayments vs Tempo", "url": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-tempo" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-tempo.json", "title": "Crossmint API + Docs MCP vs Tempo", "url": "https://www.anchorterminal.com/compare/crossmint-vs-tempo" }, { "json": "https://www.anchorterminal.com/compare/adyen-mcp-server-vs-crossmint.json", "title": "Adyen MCP server vs Crossmint API + Docs MCP", "url": "https://www.anchorterminal.com/compare/adyen-mcp-server-vs-crossmint" }, { "json": "https://www.anchorterminal.com/compare/crossmint-vs-paypal-mcp-server.json", "title": "Crossmint API + Docs MCP vs PayPal MCP server", "url": "https://www.anchorterminal.com/compare/crossmint-vs-paypal-mcp-server" }, { "json": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-nevermined.json", "title": "Circle Gateway Nanopayments vs Nevermined API + MCP", "url": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-nevermined" }, { "json": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-payman.json", "title": "Circle Gateway Nanopayments vs Payman Genie MCP", "url": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-payman" }, { "json": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-stripe-mcp.json", "title": "Circle Gateway Nanopayments vs Stripe API + MCP", "url": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-stripe-mcp" } ], "scores": [ { "by": 3, "circle-gateway-nanopayments": 56, "crossmint": 53, "edge": "circle-gateway-nanopayments", "key": "reliability", "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 9, "circle-gateway-nanopayments": 80, "crossmint": 71, "edge": "circle-gateway-nanopayments", "key": "schema", "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 4, "circle-gateway-nanopayments": 75, "crossmint": 71, "edge": "circle-gateway-nanopayments", "key": "ergonomics", "name": "Agent ergonomics", "weight": 13 }, { "by": 9, "circle-gateway-nanopayments": 64, "crossmint": 73, "edge": "crossmint", "key": "security", "name": "Security \u0026 auth", "weight": 14 }, { "by": 30, "circle-gateway-nanopayments": 80, "crossmint": 50, "edge": "circle-gateway-nanopayments", "key": "payments", "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 8, "circle-gateway-nanopayments": 77, "crossmint": 85, "edge": "crossmint", "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 8, "circle-gateway-nanopayments": 72, "crossmint": 80, "edge": "crossmint", "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Circle Gateway Nanopayments and Crossmint API + Docs MCP score within a point of each other on agent readiness, 67.6 (B) and 67.1 (B). Crossmint API + Docs MCP leads on security \u0026 auth, maintenance \u0026 community and transparency \u0026 trust. Both do x402 payments.", "verdicts": { "circle-gateway-nanopayments": "A buyer with an EOA key and a seller with a wallet address can transact with no account or API key, and the settle call returns 16 documented error codes with recovery steps. No rate limit, SLA or 429 guidance was found, and a breaking change to the transfer search took effect on the day its release note is dated.", "crossmint": "Agent Wallets are non-custodial, with spend caps, allowed counterparties and time windows enforced onchain. No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint", "json": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint.md", "slim": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint.min.md" }, "markdown": "Circle Gateway Nanopayments and Crossmint API + Docs MCP score within a point of each other on agent readiness, 67.6 (B) and 67.1 (B). Crossmint API + Docs MCP leads on security \u0026 auth, maintenance \u0026 community and transparency \u0026 trust. Both do x402 payments.\n\n- Circle Gateway Nanopayments: grade B, 67.6/100, rank #247 of 950. Markdown https://www.anchorterminal.com/tools/circle-gateway-nanopayments.md · JSON https://www.anchorterminal.com/api/v1/tools/circle-gateway-nanopayments.json\n- Crossmint API + Docs MCP: grade B, 67.1/100, rank #260 of 950. Markdown https://www.anchorterminal.com/tools/crossmint.md · JSON https://www.anchorterminal.com/api/v1/tools/crossmint.json\n- Best payment and monetisation platforms for AI agents: https://www.anchorterminal.com/best/payment-platforms/index.md\n- All 76 platforms comparisons: https://www.anchorterminal.com/compare/payment-platforms/index.md\n\n## Which one, for what\n\n### Circle Gateway Nanopayments (B)\n\nGood for: Sellers charging fractions of a cent per API call and agents making many small payments from one prefunded balance on EVM chains.\n\nAhead on:\n- Schema \u0026 documentation, 80 against 71\n- Payments \u0026 pricing, 80 against 50\n\nAlso in its favour:\n- No key needed to call it\n\nWatch for: No rate limit, 429 guidance or SLA was found for the Gateway API in the reviewed documentation\n\n### Crossmint API + Docs MCP (B)\n\nGood for: Products that let agents spend, especially where a user wants a capped card or a capped stablecoin wallet for an agent, or an agent that buys from ordinary merchant sites.\n\nAhead on:\n- Security \u0026 auth, 73 against 64\n- Maintenance \u0026 community, 85 against 77\n- Transparency \u0026 trust, 80 against 72\n\nAlso in its favour:\n- No incidents deducted, where Circle Gateway Nanopayments loses 3 points for them\n\nWatch for: No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts\n\n\n## Score by category\n\n| Category | Weight | Circle Gateway Nanopayments | Crossmint API + Docs MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 56 | 53 | Circle Gateway Nanopayments +3 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 80 | 71 | Circle Gateway Nanopayments +9 |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 71 | Circle Gateway Nanopayments +4 |\n| Security \u0026 auth | 14% (17.5 this run) | 64 | 73 | Crossmint API + Docs MCP +9 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 80 | 50 | Circle Gateway Nanopayments +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 77 | 85 | Crossmint API + Docs MCP +8 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 72 | 80 | Crossmint API + Docs MCP +8 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **67.6 · B** | **67.1 · B** | |\n\n## Facts side by side\n\n| Fact | Circle Gateway Nanopayments | Crossmint API + Docs MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Circle | Crossmint |\n| Hosted endpoint | `https://gateway-api.circle.com` | `https://www.crossmint.com/api` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | None | API key |\n| Pricing | Pay per use | Freemium |\n| x402 | payer tooling only | payer tooling only |\n| Licence | Proprietary hosted service under the Circle Developer Terms. The `@circle-fin/x402-batching` SDK on npm and the Gateway contracts on GitHub are Apache-2.0 | Apache-2.0 |\n| Tools exposed | none | 1 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-16 | 2026-10-01 |\n| Terms last updated | 2026-09-16 | 2026-07-01 |\n| Privacy policy last updated | no date given | 2026-09-21 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | yes | not found in the text |\n| Terms or service can change without notice | yes | yes |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 17k npm/wk | 52 stars, 40k npm/wk |\n| Agent reviews | none | 3.5/5 (2) |\n\n## Verdicts\n\n**Circle Gateway Nanopayments.** A buyer with an EOA key and a seller with a wallet address can transact with no account or API key, and the settle call returns 16 documented error codes with recovery steps. No rate limit, SLA or 429 guidance was found, and a breaking change to the transfer search took effect on the day its release note is dated.\n\n**Crossmint API + Docs MCP.** Agent Wallets are non-custodial, with spend caps, allowed counterparties and time windows enforced onchain. No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts.\n\n## Before you call either\n\n### Circle Gateway Nanopayments\n\n1. Deposit on the chain you will pay from. `GatewayClient` scopes deposits and payments to its configured chain, and deposits on Base, Ethereum, Arbitrum or OP take about 13 to 19 minutes\n2. Set `validBefore` at least 7 days ahead when signing by hand. The SDK uses 604900 seconds\n3. Register `onBeforePaymentCreation` and abort above a cap. `pay(url)` signs whatever amount the seller's 402 response asks for\n4. Call `settle` without a prior `verify`. Balance and nonce checks happen only at settle time\n5. Pass `from`, `to` or `nonce` whenever you filter transfers by `status`, and wait for `completed` before a dependent onchain step\n\n### Crossmint API + Docs MCP\n\n1. Send an `x-idempotency-key` on every transaction or transfer create so a retry can't pay twice\n2. Use staging keys against testnets; production keys work on mainnets only, and Agent Checkouts has no staging at all\n3. On 429, wait and retry. No Retry-After header is documented, and writes are capped at 120 a minute per project\n4. Use Agent Wallets for x402 and MPP endpoints and Agent Cards for card merchants; they aren't interchangeable\n5. Append `.md` to any docs URL for a Markdown copy\n\n## Questions\n\n### Which is better for AI agents, Circle Gateway Nanopayments or Crossmint API + Docs MCP?\n\nCircle Gateway Nanopayments and Crossmint API + Docs MCP score within a point of each other on agent readiness, 67.6 (B) and 67.1 (B). Crossmint API + Docs MCP leads on security \u0026 auth, maintenance \u0026 community and transparency \u0026 trust.\n\n### Do Circle Gateway Nanopayments and Crossmint API + Docs MCP need an API key?\n\nCircle Gateway Nanopayments needs no key. Crossmint API + Docs MCP needs an API key.\n\n### Can an agent call Circle Gateway Nanopayments and Crossmint API + Docs MCP without installing anything?\n\nYes. Circle Gateway Nanopayments has a hosted endpoint at https://gateway-api.circle.com and Crossmint API + Docs MCP at https://www.crossmint.com/api.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint.json, and with the fewest tokens: https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"circle-gateway-nanopayments\", \"b\": \"crossmint\"}`. From a terminal: `anchor compare circle-gateway-nanopayments crossmint`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/circle-gateway-nanopayments.json and https://www.anchorterminal.com/api/v1/tools/crossmint.json\n\n## Other comparisons with Circle Gateway Nanopayments or Crossmint API + Docs MCP\n\n- [Agentcard vs Crossmint API + Docs MCP](https://www.anchorterminal.com/compare/agentcard-vs-crossmint.md)\n- [Crossmint API + Docs MCP vs Lago](https://www.anchorterminal.com/compare/crossmint-vs-lago.md)\n- [Crossmint API + Docs MCP vs Nevermined API + MCP](https://www.anchorterminal.com/compare/crossmint-vs-nevermined.md)\n- [Crossmint API + Docs MCP vs Orb](https://www.anchorterminal.com/compare/crossmint-vs-orb.md)\n- [Crossmint API + Docs MCP vs Paid](https://www.anchorterminal.com/compare/crossmint-vs-paid.md)\n- [Crossmint API + Docs MCP vs Payman Genie MCP](https://www.anchorterminal.com/compare/crossmint-vs-payman.md)\n- [Crossmint API + Docs MCP vs Skyfire API + MCP](https://www.anchorterminal.com/compare/crossmint-vs-skyfire.md)\n- [Crossmint API + Docs MCP vs Stripe API + MCP](https://www.anchorterminal.com/compare/crossmint-vs-stripe-mcp.md)\n- [ATXP vs Circle Gateway Nanopayments](https://www.anchorterminal.com/compare/atxp-vs-circle-gateway-nanopayments.md)\n- [ATXP vs Crossmint API + Docs MCP](https://www.anchorterminal.com/compare/atxp-vs-crossmint.md)\n- [Circle Gateway Nanopayments vs Skyfire API + MCP](https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-skyfire.md)\n- [Circle Gateway Nanopayments vs Tempo](https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-tempo.md)\n- [Crossmint API + Docs MCP vs Tempo](https://www.anchorterminal.com/compare/crossmint-vs-tempo.md)\n- [Adyen MCP server vs Crossmint API + Docs MCP](https://www.anchorterminal.com/compare/adyen-mcp-server-vs-crossmint.md)\n- [Crossmint API + Docs MCP vs PayPal MCP server](https://www.anchorterminal.com/compare/crossmint-vs-paypal-mcp-server.md)\n- [Circle Gateway Nanopayments vs Nevermined API + MCP](https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-nevermined.md)\n- [Circle Gateway Nanopayments vs Payman Genie MCP](https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-payman.md)\n- [Circle Gateway Nanopayments vs Stripe API + MCP](https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-stripe-mcp.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Circle Gateway Nanopayments vs Crossmint API + Docs MCP", "url": "" } ], "description": "Circle Gateway Nanopayments and Crossmint API + Docs MCP score within a point of each other for x402 payments, 67.6 and 67.1 out of 100. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Circle Gateway Nanopayments B 67.6", "Crossmint API + Docs MCP B 67.1", "scores" ], "h1": "Circle Gateway Nanopayments vs Crossmint API + Docs MCP", "image": "https://www.anchorterminal.com/assets/og/compare-circle-gateway-nanopayments-vs-crossmint.png", "path": "/compare/circle-gateway-nanopayments-vs-crossmint", "published": "2026-10-01", "section": "tools", "title": "Circle Gateway Nanopayments vs Crossmint API + Docs MCP (2026)", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/circle-gateway-nanopayments-vs-crossmint" }, "tokens": { "markdown": 2550, "slim": 730 }, "version": 1 }