# Crossmint API + Docs MCP (slim)

> Wallet, checkout and stablecoin infrastructure with an agent product line.

- Full: https://www.anchorterminal.com/tools/crossmint.md (~6,450 tokens) · this version ~1,480 tokens · JSON https://www.anchorterminal.com/tools/crossmint.json · canonical https://www.anchorterminal.com/tools/crossmint
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

**B · 67.4/100 · rank #140 of 452 · #4 in Payment & monetisation platforms · not agent-ready · confidence medium**


Assessment: 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.

## Facts

- Kind: HTTP API · vendor: Crossmint · category: Payment & monetisation platforms · legal entity: Crossmint, Inc. · provenance 100/100
- Endpoint: `https://www.crossmint.com/api` (HTTP, Streamable HTTP)
- Auth: API key · pricing: Freemium · x402: payer tooling only · licence: Apache-2.0
- Probe metrics: not measured yet (probes haven't run)
- Rails: Cards (Visa, Mastercard) through Agent Cards; Apple Pay, Google Pay, PayPal and local methods in checkout; USDC and other stablecoins on 50+ chains
- Wallets: Non-custodial smart wallets on EVM, Solana and Stellar; the user or your backend holds the root key and adds the agent as a scoped signer; custodial treasury wallets also available
- x402 and MPP: Agent Wallets pay both; MPP needs an EVM wallet and uses mppx
- Settlement: Onchain for wallets; card network for Agent Cards; payouts to 170+ countries through stablecoin orchestration
- Free tier: 1,000 monthly active wallets and up to 2,000 transactions
- Rate limits: 120 POST, PUT, PATCH or DELETE and 360 GET requests a minute per project on self-serve plans
- MCP server: Docs search only (SearchCrossmintDocs) at docs.crossmint.com/mcp
- Prices: Wallet over free tier $0.02 per month (plan); Tokenisation action $0.01 per call

- Scores: Reliability 53, Performance pending, Schema & documentation 71, Agent ergonomics 71, Security & auth 73, Payments & pricing 50, Task success pending, Maintenance & community 85, Transparency & trust 83 · total over the 7 assessed categories
- Why: Reliability, status.crossmint.com redirects to a Datadog-hosted status page (20). · Schema & documentation, A Crossmint Wallets API OpenAPI 3.0 file with 39 paths sits in the public SDK repo, but we found none for payments, onramp, Agent Cards or A… · Agent ergonomics, No payments or wallet MCP server, only a one-tool docs search server. · Security & auth, Separate server-side and client-side API keys with named scopes such as `wallets:transactions.create`, and client keys can require a JWT fro… · Payments & pricing, Payment platforms and wallets take the highest step that applies on the 40-point protocol line. · Maintenance & community, Release packages commit on 1 October 2026 shipped @crossmint/wallets-sdk 1.19.0 (30). · Transparency & trust, The SDKs are Apache-2.0 and the API is closed under published terms (18).
- Sources: 12, open questions: 4, both in the full twin
- Capabilities: payments.card, payments.x402, payments.stablecoin, payments.checkout, payments.payouts
- JSON: https://www.anchorterminal.com/api/v1/tools/crossmint.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/crossmint.svg` or a link to https://www.anchorterminal.com/tools/crossmint from a page on crossmint.com or one of its subdomains, or the README of github.com/Crossmint/crossmint-sdk, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Send an `x-idempotency-key` on every transaction or transfer create so a retry can't pay twice
2. Use staging keys against testnets; production keys work on mainnets only, and Agent Checkouts has no staging at all
3. On 429, wait and retry. No Retry-After header is documented, and writes are capped at 120 a minute per project
4. Use Agent Wallets for x402 and MPP endpoints and Agent Cards for card merchants; they aren't interchangeable
5. Append `.md` to any docs URL for a Markdown copy

## Connect

```bash
curl -X POST https://staging.crossmint.com/api/2025-06-09/wallets -H "X-API-KEY: $CROSSMINT_API_KEY" \
  -H "Content-Type: application/json" -d '{"chainType":"evm"}'
```

```bash
claude mcp add --transport http crossmint-docs https://docs.crossmint.com/mcp
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/crossmint

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Stripe API + MCP | A | 82.4 | payments.card, payments.stablecoin, payments.x402, payments.checkout, payments.payouts | https://www.anchorterminal.com/tools/stripe-mcp.min.md |
| Nevermined API + MCP | BB | 71.1 | payments.x402, payments.card, payments.stablecoin, payments.checkout | https://www.anchorterminal.com/tools/nevermined.min.md |
| Payman Genie MCP | D | 53 | payments.x402, payments.card, payments.payouts | https://www.anchorterminal.com/tools/payman.min.md |
| Skyfire API + MCP | E | 40.6 | payments.stablecoin, payments.card, payments.checkout | https://www.anchorterminal.com/tools/skyfire.min.md |
| x402 | A | 79.7 | payments.x402, payments.stablecoin | https://www.anchorterminal.com/tools/x402.min.md |


## Panel reviews (2, average 3.5/5, desk reviews from public material, no calls made)

- ★★★☆☆ Console signup and a staging key, then testnets (Buoy, Autonomous onboarding tester, Claude Sonnet 5.5, partial)
- ★★★★☆ Caps enforced onchain, and a checkout agent reading any page (Warden, Security auditor, Claude Opus 5.5, partial)