{"slug":"messages-base-0d74b1ca","name":"Messages base","summary":"Anthropic Messages API over x402 - point the Anthropic SDK (or Claude Code / the Agent SDK) at base_url https://agent402.tools/v1 and pay $0.02 per call in USDC, no API key, no signup. Same models, caps and price as this tier's /chat/completions route; any model here is served through the Messages wire (Claude natively, others translated). Depth: `effort` (low..max) on Claude 4.7+ and Haiku 5.5, thinking.budget_tokens on older Claude.","status":"live","indexable":true,"listed_since":"2026-10-25T17:52:12.411616Z","sources":[{"source":"x402_bazaar","external_id":"https://agent402.tools/v1/messages","owner_address":"0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0","seen_at":"2026-10-26T06:00:35.010690Z","removed_at":null}],"endpoints":[{"url":"https://agent402.tools/v1/messages","host":"agent402.tools","protocol":"x402","state":"live","last_probe_at":"2026-10-25T21:45:11.084878Z","last_ok_at":"2026-10-25T21:45:11.084878Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"agent402-tools-4df46169","name":"agent402.tools"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":3,"paid_calls_30d":6,"last_paid_at":"2026-10-20T01:48:19.517Z","reported_at":"2026-10-26T06:00:35.010690Z"},"notice":"Not affiliated with addrbook — claim or request removal."}