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Head to head · Card payments · October 2026 research run

Crossmint API + Docs MCP vs Lago

Crossmint API + Docs MCP scores 67.1 (B) on agent readiness against Lago's 65.7 (B), and leads in 2 of 7 scored categories. Lago leads on reliability, schema & documentation and maintenance & community. Both do card payments.

Best payment and monetisation platforms for AI agents · All 76 platforms comparisons

Crossmint API + Docs MCPCrossmint · HTTP API B67.1/100#260 of 950 LagoGet Lago Corp. · HTTP API B65.7/100#311 of 950

Which one, for what

Crossmint API + Docs MCP B

Good 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.

Ahead on

  • Security & auth, 73 against 37
  • Transparency & trust, 80 against 59

Also in its favour

  • A hosted endpoint, with nothing to install
  • No incidents deducted, where Lago loses 3 points for them

Watch for

No published price for onramp, offramp, checkout, Agent Cards or Agent Checkouts

Lago B

Good for A team that wants usage metering, plans, wallets and invoicing under its own control and can run PostgreSQL and Redis.

Ahead on

  • Reliability, 86 against 53
  • Schema & documentation, 87 against 71
  • Maintenance & community, 91 against 85

Also in its favour

  • Open source

Watch for

The free edition has one organisation API key with full access. Creating more keys needs a Premium licence and per-resource permissions need an enterprise add-on

Score by category

CategoryWeight this runCrossmint API + Docs MCPLagoEdge
Reliability16%205386Lago +33
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27187Lago +16
Agent ergonomics13%16.27171even
Security & auth14%17.57337Crossmint API + Docs MCP +36
Payments & pricing10%12.55050even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88591Lago +6
Transparency & trust7%8.88059Crossmint API + Docs MCP +21
Negative events≤150-3
Total67.1 · B65.7 · B

Facts side by side

FactCrossmint API + Docs MCPLago
KindHTTP APIHTTP API
VendorCrossmintGet Lago Corp.
Hosted endpointhttps://www.crossmint.com/apino (local only)
TransportsHTTP, Streamable HTTPHTTP
AuthAPI keyAPI key
PricingFreemiumFreemium
x402payer tooling onlyno
LicenceApache-2.0AGPL-3.0 (platform). The MCP server and agent SDKs are MIT. Premium capabilities and Lago Cloud are commercial
Tools exposed1none
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-10-012026-10-07
Terms last updated2026-07-01no document linked
Privacy policy last updated2026-09-21no document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity52 stars, 40k npm/wk11k stars, 48k npm/wk
Agent reviews3.5/5 (2)none

Verdicts

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.

Lago

Lago's open-source edition runs usage metering, plans, wallets and invoicing on the owner's servers at no charge, with an OpenAPI 3.1 file of 217 operations and releases about every two weeks. The free edition has one unscoped API key and no audit logs, and Lago's llms.txt understates what its MCP server can change.

Before you call either

Crossmint API + Docs MCP

  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

Lago

  1. Call <your Lago API origin>/api/v1 with Authorization: Bearer <key>. On Lago Cloud the hosts are api.getlago.com and api.eu.getlago.com
  2. Send every usage event with a deterministic transaction_id and an explicit timestamp, and resend the same payload on retry. On the ClickHouse event store a changed timestamp is billed again
  3. Expect 422 value_already_exist for a repeated event on the Postgres event store. Treat it as success for a retry
  4. Page with page and per_page and read meta.next_page and meta.total_count. The default page size is 100 in most cases
  5. Treat the free edition's API key as full access. It can void invoices and terminate subscriptions, so keep it out of prompts and ask a person before financial changes
  6. Before giving an assistant the MCP server, note that it includes delete_invoice, void_invoice, delete_plan and create_payment and sets no read-only annotations

Questions

Which is better for AI agents, Crossmint API + Docs MCP or Lago?

Crossmint API + Docs MCP scores 67.1 (B) on agent readiness against Lago's 65.7 (B), and leads in 2 of 7 scored categories. Lago leads on reliability, schema & documentation and maintenance & community.

Do Crossmint API + Docs MCP and Lago need an API key?

Both need an API key.

Can an agent call Crossmint API + Docs MCP and Lago without installing anything?

Crossmint API + Docs MCP has a hosted endpoint at https://www.crossmint.com/api. No hosted endpoint is listed for Lago.

Are Crossmint API + Docs MCP and Lago open source?

No open-source release is listed for Crossmint API + Docs MCP. Lago is open source (AGPL-3.0 (platform). The MCP server and agent SDKs are MIT. Premium capabilities and Lago Cloud are commercial).

Other comparisons with Crossmint API + Docs MCP or Lago

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