https://x402.agentindex.world/llm/claude-sonnet
Claude Sonnet API - pay per call, no API key. OpenAI-format chat completions on anthropic/claude-sonnet-5.5, pinned to Anthropic's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if it fires; set your client timeout to 30s. Try GET /llm/claude-sonnet/sample.
—
$0.0019
68
54
Points earned against points available, biggest lever first.
| Rank | Service | Score | Volume | Price |
|---|---|---|---|---|
| #1 | 68 | 7.0K txns | $0.0010 | |
| #2 | Otto AI−66 | 66 | 3.6K txns | $0.0010 |
| #3 | Bitrefill−63 | 63 | 365 txns | $0.0020 |
| #4 | 63 | 2.5K txns | $0.02 |
| #5 | 62 | 1.1K txns | $0.01 |