{"id":"buttondown","name":"Buttondown","url":"https://buttondown.com","category":["publishing","newsletter","email","marketing","developer-platform"],"one_liner":"Newsletter platform with REST API, OpenAPI 3.1 schema, CLI, webhooks, scoped API keys, subscriber and email endpoints, and paid API access.","a_score":40,"band":"unverified","provisional_band":"friction","dimensions":{"access":0,"payment":12,"interface":18,"completion":null,"docs":10},"permission":{"status":"granted","source":"https://docs.buttondown.com/api-introduction"},"blocker":{"kind":"human-escalation"},"how_to_use":{"interface":"openapi","mcp":null,"openapi":"https://docs.buttondown.com/openapi.json","base_url":"https://api.buttondown.com/v1/","payment":{"model":"card","currencies":["USD"],"reference_task_cost_usd":null}},"verified":{"verdict":"not-attempted","at":"2026-09-14","human_interventions":0,"transcript_sha":null},"rubric":"sha256:cd605a44799f49951bf078fda63c5b21ad3c07db494f41d38ad19ce729c5551a","last_verified_at":"2026-09-14","audit_url":"/entry/buttondown/audit.json","compact_note":"Public machine card is compacted for FANA scanner compatibility and deployment size. Full source entry and signed audit event body remain in the ag3ntsearch git tree; audit_url publishes hash-chain provenance."}