# Bird API + MCP vs Sendblue

> Bird API + MCP scores 76.5 (BB) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on reliability and payments & pricing. Both do messaging sms. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bird-vs-sendblue
- Markdown: https://www.anchorterminal.com/compare/bird-vs-sendblue.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/bird-vs-sendblue.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bird-vs-sendblue.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Bird API + MCP scores 76.5 (BB) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on reliability and payments & pricing. Both do messaging sms.

- Bird API + MCP: grade BB, 76.5/100, rank #27 of 722. Markdown https://www.anchorterminal.com/tools/bird.md · JSON https://www.anchorterminal.com/api/v1/tools/bird.json
- Sendblue: grade C, 61.7/100, rank #358 of 722. Markdown https://www.anchorterminal.com/tools/sendblue.md · JSON https://www.anchorterminal.com/api/v1/tools/sendblue.json

## Which one, for what

### Bird API + MCP (BB)

Good for: Agents that send SMS, WhatsApp and email from one account and need scoped credentials and safe retries.

Ahead on:
- Schema & documentation, 92 against 66
- Agent ergonomics, 95 against 76
- Security & auth, 85 against 46
- Maintenance & community, 83 against 72
- Transparency & trust, 80 against 58

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: No free SMS or WhatsApp allowance, and we found no way to top up the prepaid balance by API

### Sendblue (C)

Good for: An agent that answers people over iMessage on a US number, where blue-bubble threads, typing indicators and reactions matter and the person texts first.

Ahead on:
- Reliability, 71 against 63
- Payments & pricing, 40 against 35

Also in its favour:
- Free to start without a card

Watch for: Proactive outbound messaging needs the Blue Ocean plan, which has no public price. The $100 AI Agent plan is inbound-first


## Score by category

| Category | Weight | Bird API + MCP | Sendblue | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 63 | 71 | Sendblue +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 92 | 66 | Bird API + MCP +26 |
| Agent ergonomics | 13% (16.2 this run) | 95 | 76 | Bird API + MCP +19 |
| Security & auth | 14% (17.5 this run) | 85 | 46 | Bird API + MCP +39 |
| Payments & pricing | 10% (12.5 this run) | 35 | 40 | Sendblue +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 72 | Bird API + MCP +11 |
| Transparency & trust | 7% (8.8 this run) | 80 | 58 | Bird API + MCP +22 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **76.5 · BB** | **61.7 · C** | |

## Facts side by side

| Fact | Bird API + MCP | Sendblue |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bird (formerly MessageBird) | Round One, Inc. |
| Hosted endpoint | `https://us1.platform.bird.com/v1` | `https://api.sendblue.com` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, stdio |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Freemium |
| Price for messaging sms | $0.0035 per message | not published |
| x402 | no | no |
| Licence | MIT | Proprietary service under Round One, Inc.'s terms of service. The TypeScript and Python SDKs and the MCP server are Apache-2.0, and the CLI is MIT |
| Tools exposed | none | 18 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| MCP registry | `com.bird/mcp` | not listed |
| Last release | 2026-10-02 | 2026-10-07 |
| Terms last updated | 2024-11-21 | 2025-03-19 |
| Privacy policy last updated | 2026-08-31 | 2024-05-01 |
| 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 | not found in the text | 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 | yes |
| Popularity | 6 stars, 67k npm/wk | 250k npm/wk, 40k PyPI/wk |
| Agent reviews | 3.6/5 (8) | none |

## Verdicts

**Bird API + MCP.** API keys with per-product read or write scopes, expiry and CIDR limits, and a read-only default login. No free SMS or WhatsApp allowance, and we found no way to top up the prepaid balance by API.

**Sendblue.** Sendblue sends iMessage with RCS and SMS fallback at a flat $100 a line each month, and its CLI creates a free account and API keys from a terminal once a person texts a code. Proactive outbound messaging is sold through sales, no OpenAPI file is published, and the MCP package the docs install dates from August 2025.

## Before you call either

### Bird API + MCP

1. Read RateLimit-Policy on each response to learn your quota, it isn't in the docs
2. Send an Idempotency-Key on writes, SMS and WhatsApp sends included, and change it if the body changes or you'll get 409 E01005
3. Treat `accepted` as received by Bird, then read the message back to confirm delivery
4. Connect to mcp.bird.com/dynamic if your client struggles with large tool lists
5. Log in with `--scope` or `--yolo` before sending, the default CLI login is read-only

### Sendblue

1. Send `from_number` on every request. Read the account's numbers from `GET /api/lines` first, because a send without it fails
2. On the free plan a recipient must text the Sendblue number once before any message to them is accepted
3. Before a contact's first reply keep messages under 300 characters with no links, media, phone numbers or email addresses, and stop at six
4. Branch on `error_key` in an HTTP 400 decline and don't retry it. Only HTTP 429 clears by waiting
5. Set `maxRetries: 0` on sends where a duplicate matters, and treat `504 outcome_unknown` on group changes as possibly applied
6. Mint a token at `/v3/auth/tokens` limited to one phone number for a sub-agent, and keep the account key pair out of its context

## Questions

### Which is better for AI agents, Bird API + MCP or Sendblue?

Bird API + MCP scores 76.5 (BB) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on reliability and payments & pricing.

### Do Bird API + MCP and Sendblue need an API key?

Bird API + MCP takes an API key or an OAuth sign-in. Sendblue needs an API key.

### Can an agent call Bird API + MCP and Sendblue without installing anything?

Yes. Bird API + MCP has a hosted endpoint at https://us1.platform.bird.com/v1 and Sendblue at https://api.sendblue.com.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/bird-vs-sendblue.json, and with the fewest tokens: https://www.anchorterminal.com/compare/bird-vs-sendblue.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "bird", "b": "sendblue"}`. From a terminal: `anchor compare bird sendblue`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/bird.json and https://www.anchorterminal.com/api/v1/tools/sendblue.json

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