APITemplate.io vs PostNitro

APITemplate.io

A public OpenAPI description covers 12 operations, with rate limits, four regional endpoints and a 99.9 per cent uptime SLA published. Each account or team has one unscoped API key, no changelog or deprecation notices were found, the SDK repositories date from September 2023, and two documentation pages name different regional hostnames.

PostNitro

A hosted MCP server and REST API let an agent turn a topic, article or own slides into a branded carousel, image or slide video and schedule it, with OAuth, numbered rate limits and Markdown docs. No status page, security contact or idempotency key was found, and the privacy policy contradicts the vendor's no-training statement.

APITemplate.io

1. Send the key in the X-API-KEY header and pick the regional host first, because requests and output are processed and stored in that region
2. Call GET /v2/list-templates with with_layer_info=1 before POST /v2/create-image, so the name values in overrides match the template's elements
3. Set meta to your own reference on each generation and check GET /v2/list-objects before retrying, since there is no idempotency key
4. Set expiration in minutes (1 to 10080) or export_type=file for sensitive output. By default the download URL does not expire
5. For async=1 you must pass webhook_url. The callback is a GET with the result in the query string, retried three times
6. On HTTP 429 pause and retry on your own schedule. The docs give no Retry-After header or backoff interval

PostNitro

1. Call postnitro_set_defaults once with a template, brand and AI preset, or every generate call must carry those IDs
2. Pass the designId from postnitro_get_output to scheduling, never the embedPostId, or the call fails with Design not found
3. For a LinkedIn PDF post, set linkedinPostSettings.postType to document with a 5 to 90 character postTitle
4. Ask for the DESIGN output or save as DRAFT when a person must approve before anything publishes
5. Keep to 5 create calls a minute per key and wait for Retry-After on a 429