x402 census · modelprices.xyz · e383150624ad · JSON
GET /llm/cheapest/reasoning
live
Cheapest reasoning-model leaderboard: the 50 lowest-cost AI models with extended reasoning / chain-of-thought support, ranked by inference cost per token — o3, Claude 5 thinking, Gemini 3 Pro, DeepSeek R1, Qwen QwQ and more across 70+ providers. Input, output and cache USD per 1M tokens with context windows joined in. Refreshed hourly.
Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-01).
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://modelprices.xyz/llm/cheapest/reasoning |
| Method | GET |
| Price | $0.01 USDC = 10000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0x63a20fa244d3E6a8902121E99704b7F857dc6EBB |
| Seller | modelprices.xyz |
| Catalogs | cdp (row updated 2026-09-28) |
| Listed since (lower bound) | 2026-09-28 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-28 |
| CDP quality counters | 1 calls and 1 unique payers in 30 days, last call 2026-09-28 (catalog-reported, not verified on chain) |
| Category (keyword rule) | inference/llm |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | none |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
Latest re-probe
| Field | Value |
|---|---|
| Re-probed at | 2026-10-01T06:13:18.000Z (cron) |
| Verdict now | live changed from unprobed |
| HEAD / GET | 200 / 402 |
| accepts[0] | {"scheme":"exact","network":"eip155:8453","amount":"10000","payTo":"0x63a20fa244d3E6a8902121E99704b7F857dc6EBB","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}} |
| Live amount equals catalog price | yes |
| Latency | 2,236 ms |
| Error | none |
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 3 |
| Payments | 10 |
| USDC volume | $0.05 |
| Median payment | $0.003 |
| First / last payment | 2026-07-26 / 2026-09-30 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0x63a20fa244d3E6a8902121E99704b7F857dc6EBB |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {},
"type": "http"
},
"output": {
"type": "json",
"example": {
"board": "Cheapest reasoning models",
"generated_at": "2026-07-14T02:00:00.000Z",
"model_count": 24,
"models": [
{
"context_window": 200000,
"id": "deepseek-r1",
"input_per_mtok": 3,
"output_per_mtok": 15,
"provider": "anthropic"
}
]
}
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://modelprices.xyz/llm/cheapest/reasoning' -H 'accept: application/json'
The catalog declares GET. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.
Paid checks (x402, USDC on Base)
GET https://bazaar.agentexchange.work/r/e383150624ad/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"e383150624ad"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.
Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on modelprices.xyz.