Category · Everyday APIs
Contact and address book APIs for AI agents
APIs that read and update a person's own contacts and address book, search people they know and keep contact records in sync across accounts. Compared on read and write coverage, search, sync tokens, OAuth scopes and limits.
Capability keys contacts.read · contacts.write · contacts.search · contacts.sync · contacts.groups · All tools
letme.dev/contacts.read picks the top-graded tool in this list and says how to call it direct; calling through letme comes later.
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
https://www.anchorterminal.com/api/v1/searchFilters
| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 346 | Google People APIGoogle · HTTP API | Contacts | B | 65.2 | none | n/a | n/a | Free | OAuth | Hosted | ||
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Google's REST API for a user's Google Contacts, contact groups, "Other contacts" and Workspace directory profiles, with incremental sync tokens and a read-only remote MCP server in developer preview. Top strength Separate read-only scopes for contacts, other contacts, the directory and individual profile fields Top weakness No status page covers Contacts or the People API |
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| 369 | Microsoft Graph People and Contacts APIMicrosoft · HTTP API | Contacts | B | 64.6 | none | n/a | n/a | Your plan | OAuth | Hosted | ||
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Microsoft Graph endpoints for a user's Outlook personal contacts and contact folders, with delta sync, and the people API, which ranks the people most relevant to a user and supports fuzzy search. Top strength People API ranks contacts and colleagues by relevance and supports fuzzy name search Top weakness No idempotency key on contact creation, so retries can duplicate |
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| 966 | ContactsPlusContacts Plus LLC · HTTP API | Contacts | E | 42.4 | none | n/a | n/a | $9.99 / mo | OAuth | Hosted | ||
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ContactsPlus (Contacts+) is a contact manager that syncs, deduplicates and enriches address books across Google, iCloud and Outlook. Agents reach it through an OAuth REST Contacts API with webhooks and a remote MCP server for Premium users. Top strength One API over contacts synced from Google, iCloud and Outlook Top weakness No rate limits, error responses or changelog in the API reference |
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Nothing matches these filters. .
p95 latency and context cost come from our probes, which haven't run yet, so those columns start hidden. Grades run from AA to F, and agent-ready means BB or better. Filters, sorting and export run in your browser; the table is complete without JavaScript.
How we test this category
In this run, public evidence against the published checklist. When the task suites run, one test account's contacts read, searched, created, updated and deleted through each listing's API, then synced after a change made elsewhere. We check field coverage, incremental sync, scopes and error handling. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.
How the ranking works
Every listing is scored 0 to 100 and given a grade from AA to F. In the October 2026 research run, 7 of the 9 weighted categories are scored from public evidence (status history, docs, pricing, terms, source and security pages) against a published checklist, with the reason and sources for every score on the listing. Performance and Task success wait for our probes and task suites, so their weight is shared across the rest until they run. Negative events deduct up to 15 points. Read the methodology.
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