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Head to head · Spend transactions · October 2026 research run

Payhawk API + MCP vs Spendesk API + MCP

Spendesk API + MCP scores 62.3 (B) on agent readiness against Payhawk API + MCP's 57.1 (C), and leads in 5 of 7 scored categories. Payhawk API + MCP leads on payments & pricing. Both do spend transactions.

Payhawk API + MCPPayhawk Limited · HTTP API C57.1/100#561 of 841 Spendesk API + MCPSpendesk SAS · HTTP API B62.3/100#395 of 841

Which one, for what

Payhawk API + MCP C

Good for A finance team already on Payhawk that wants an ERP or accounting sync, master data kept in step, purchase orders raised from another system, or an assistant that answers spend questions and prepares approvals.

Ahead on

  • Payments & pricing, 13 against 0

Watch for

No self-serve route. The API needs a Payhawk customer account, and a development sandbox is requested through a form

Spendesk API + MCP B

Good for A finance team already on Spendesk that wants an assistant to analyse spend, follow invoices and prepare the accounting close, or an ERP sync reading payables and settlements.

Ahead on

  • Schema & documentation, 87 against 71
  • Agent ergonomics, 62 against 52
  • Security & auth, 86 against 71

Watch for

No public price, free tier or self-serve signup. API access and demo credentials are requested from a Spendesk representative

Score by category

CategoryWeight this runPayhawk API + MCPSpendesk API + MCPEdge
Reliability16%205855Payhawk API + MCP +3
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27187Spendesk API + MCP +16
Agent ergonomics13%16.25262Spendesk API + MCP +10
Security & auth14%17.57186Spendesk API + MCP +15
Payments & pricing10%12.5130Payhawk API + MCP +13
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85357Spendesk API + MCP +4
Transparency & trust7%8.87880Spendesk API + MCP +2
Negative events≤1500
Total57.1 · C62.3 · B

Facts side by side

FactPayhawk API + MCPSpendesk API + MCP
KindHTTP APIHTTP API
VendorPayhawk LimitedSpendesk SAS
Hosted endpointhttps://api.payhawk.comhttps://public-api.spendesk.com
TransportsHTTPHTTP
AuthOAuth or keyOAuth or key
PricingPaidPaid
x402nono
LicenceProprietary service under Payhawk's general terms and conditionsProprietary service under Spendesk's terms and conditions and a separate Spendesk API agreement
Tools exposed8262
Read-only variant documentedyesno
llms.txtyesyes
Last release2026-10-082026-09-29
Terms last updated2025-12-09couldn't be read
Privacy policy last updated2026-06-292025-03-01
Customer content may train modelsnot found in the textcouldn't be read
Terms restrict automated accessnot found in the textcouldn't be read
Terms restrict benchmarkingnot found in the textcouldn't be read
Terms or service can change without noticenot found in the textcouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read

Verdicts

Payhawk API + MCP

The Developer API has a public OpenAPI 3.1 definition with 179 operations, read-only or full-access keys and a published limit of 15 requests a second. It needs a Payhawk customer account, no official SDK or API changelog was found, and the 82-tool MCP server is added by hand because it is not yet in the assistant directories.

Spendesk API + MCP

Scoped credentials, MCP write permissions that are off by default, an action log and published guidance on prompt injection suit delegated finance work. Access needs a paying customer and a request to Spendesk, most write endpoints are experimental, no official SDK was found, and the status page lists three critical incidents between 2 and 29 September 2026.

Before you call either

Payhawk API + MCP

  1. Send the key in X-Payhawk-ApiKey or as a Bearer token to https://api.payhawk.com/api/v3. A read-only key returns 403 on writes
  2. Page lists with $skip and $take. The help centre gives 1,000 a page and the definition a maximum of 10,000, so count what comes back
  3. Pass $filter as URL-encoded JSON, for example {"status":{"$equal":"draft"}}. Date filters compare the date part only
  4. Keep to 15 requests a second and wait for Retry-After on a 429. Do not send Idempotency-Key when creating a per diem expense, which returns 400
  5. Use a group-level key and the /groups/{groupId} paths for master data in a multi-entity group. Expenses and payments stay on account paths

Spendesk API + MCP

  1. Request a token at POST /v1/auth/token with HTTP Basic (client ID and secret). It lasts 3,600 seconds, so renew on a 401
  2. Stop paging at the last page calculated from total and pageSize (maximum 30). A page past the end returns 404, not an empty list
  3. With an organisation-level token, send X-Company-Id on every v1 call or expect a 400
  4. The MCP server refuses API keys. Connect with OAuth authorisation code and PKCE, and treat Tool not found (-32601) as a missing permission
  5. After an unclear write result, read the object again before retrying. Creating a purchase order or supplier twice creates two

Questions

Which is better for AI agents, Payhawk API + MCP or Spendesk API + MCP?

Spendesk API + MCP scores 62.3 (B) on agent readiness against Payhawk API + MCP's 57.1 (C), and leads in 5 of 7 scored categories. Payhawk API + MCP leads on payments & pricing.

Do Payhawk API + MCP and Spendesk API + MCP need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Payhawk API + MCP and Spendesk API + MCP without installing anything?

Yes. Payhawk API + MCP has a hosted endpoint at https://api.payhawk.com and Spendesk API + MCP at https://public-api.spendesk.com.

Other comparisons with Payhawk API + MCP or Spendesk API + MCP

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