Head to head · Spend transactions · October 2026 research run
Brex vs Pleo API + MCP
Pleo API + MCP scores 62.9 (B) on agent readiness against Brex's 60.7 (C), and leads in 3 of 7 scored categories. Brex leads on agent ergonomics and payments & pricing. Both do spend transactions.
Which one, for what
Brex C
Good for A finance team already on Brex that wants an agent to read expenses and transactions, issue and lock cards, set spend limits, upload receipts and pay vendors.
Ahead on
- Agent ergonomics, 70 against 55
- Payments & pricing, 25 against 15
Watch for
The Expenses API update endpoint accepts only memo, so an outside agent can't set a category or custom field on an expense through it
Good for An agent that completes, codes, reviews and queues expenses for a Pleo customer on the Optimise plan, or for a bookkeeping integration that exports accounting entries and syncs tags, tax codes, accounts and vendors.
Ahead on
- Reliability, 71 against 60
- Transparency & trust, 75 against 67
Also in its favour
- No incidents deducted, where Brex loses 3 points for them
Watch for
The pricing page lists MCP on the Optimise plan only (£18 per user per month, three users minimum, sold through a demo)
Score by category
| Category | Weight this run | Brex | Pleo API + MCP | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 60 | 71 | Pleo API + MCP +11 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 80 | 82 | Pleo API + MCP +2 |
| Agent ergonomics | 13%16.2 | 70 | 55 | Brex +15 |
| Security & auth | 14%17.5 | 72 | 71 | Brex +1 |
| Payments & pricing | 10%12.5 | 25 | 15 | Brex +10 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 66 | 64 | Brex +2 |
| Transparency & trust | 7%8.8 | 67 | 75 | Pleo API + MCP +8 |
| Negative events | ≤15 | -3 | 0 | |
| Total | 60.7 · C | 62.9 · B |
Facts side by side
| Fact | Brex | Pleo API + MCP |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Brex LLC | Pleo Technologies A/S |
| Hosted endpoint | https://api.brex.com | https://external.pleo.io |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under the Brex Platform Agreement and the Brex Access Agreement | Proprietary service under Pleo's Master Service Agreement, API Terms of Service and AI Access Terms |
| Tools exposed | 43 | none |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-10-01 | 2026-10-02 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
Verdicts
Brex
User tokens carry per-resource scopes with read-only variants, every POST and PUT accepts an Idempotency-Key, and ten OpenAPI specs are public. The Expenses API changes only an expense's memo, there is no customer sandbox or official SDK, and the status page logs API errors lasting over four hours on 4 August 2026.
Pleo API + MCP
The hosted MCP server acts with the connecting user's own Pleo permissions, is off until an admin enables it per entity, and can't move money, change cards or alter limits. It is listed only on the Optimise plan, its tool definitions aren't published, API keys need enabling by Pleo support, and no official SDK or SLA was found.
Before you call either
Brex
- Ask an account admin or card admin for a user token with only the scopes the task needs, and prefer the
.readonlyvariants. A token unused for 90 days expires. - Send a stored
Idempotency-Keyon every POST and PUT. Create transfer and Create card reject requests without one. - Only settled transactions are returned. Poll card and cash transactions with
posted_at_startand a lookback of at least one day. - Keep under 1,000 requests in 60 seconds per client and account, and back off exponentially with jitter on 429.
- Send only ASCII in free-text fields, and quote the
X-Brex-Trace-Idresponse header when reporting an error.
Pleo API + MCP
- Ask a company admin to enable Pleo MCP access under Settings, General, Pleo AI for each entity before connecting. It is off by default
- Name the entity in every request when working outside the default one. Each MCP request targets one entity and the choice doesn't persist
- Set the AI client to require approval for Pleo write tools. Pleo leaves confirmation to the client and doesn't enforce it server-side
- Send API keys as the Basic auth username with an empty password to external.pleo.io. Legacy tokens for openapi.pleo.io don't work there
- Budget every endpoint against one bucket of 600 requests a minute per credential, and on 429 wait for Retry-After or back off from one second
- Swap mcp.staging.pleo.io for mcp.pleo.io in the Claude Code command when moving from staging to production. Each needs its own OAuth sign-in
Questions
Which is better for AI agents, Brex or Pleo API + MCP?
Pleo API + MCP scores 62.9 (B) on agent readiness against Brex's 60.7 (C), and leads in 3 of 7 scored categories. Brex leads on agent ergonomics and payments & pricing.
Do Brex and Pleo API + MCP need an API key?
Both take an API key or an OAuth sign-in.
Can an agent call Brex and Pleo API + MCP without installing anything?
Yes. Brex has a hosted endpoint at https://api.brex.com and Pleo API + MCP at https://external.pleo.io.
Other comparisons with Brex or Pleo API + MCP
Machine-readable
- This page as Markdown
/compare/brex-vs-pleo.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/brex.json·/api/v1/tools/pleo.json - From a terminal
anchor compare brex pleo(the CLI) - Over MCP
compare_tools {"a": "brex", "b": "pleo"}at/mcp, no key