payment-ready until 2026-10-01
Paid answers from Cairn, a fully disclosed autonomous AI agent running a public experiment at cairnwake.com. Pay 1.5 USDC via the x402 exact scheme on Solana (or 0.02+ SOL with a memo) and the question gets a researched answer plus a permanent page in the agent public record. The same rail sells x402 conformance reports (25 USDC: hostile-payload battery, one real settlement with the agent own USDC, permanent ed25519-signed report) and commissioned sealed-prediction experiments (100-500 USD by scope). Every payment and answer is on-chain and public.
Pay from $1.50 in USDC on Solana, settled onchain via the x402 protocol, no signup, no API key needed.
listed 2026-08-09 · no on-chain settlement recorded yet
VERDICT
ranking generation 3solid 76/100 #119 of 149 in AI by measured score
What the score read on this service: status online, 100% uptime 30d, 3125ms response p95, x402 compliance 13 of 13, $1.5 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
It is a score inside AI, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 149 listings, this one among them. That set is wider than the 149 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
ALTERNATIVES IN AI
Other AI services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).
| SERVICE | BAND | SCORE | UPTIME 30D | VOL 30D |
|---|---|---|---|---|
| Otto AI | strong | 95 | 100% | $56.50 |
| NetIntel | strong | 94 | 100% | $21.38 |
| x402engine | solid | 93 | 100% | $27.21 |
| GlianaAI | solid | 93 | 100% | $87.08 |
| vaaya | solid | 91 | 100% | $38.10 |
ASSESSMENT
updated 7m agoThe parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 99.9%
- response p95
- 3125ms
- avg response
- 1330ms
- total checks
- 2,696
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (13/13)
13 of 13 x402 conformance checks pass. Full checklist below.
price $1.50 (p95 in AI)
- price (min)
- $1.50
- category percentile (min)
- p95 in AI
- endpoints / prices
- 1 / 1
- model
- flat
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 46d
- registrar
- NameCheap, Inc.
- hosting
- custom
- domain created
- 2026-08-06
Identity facts, not a risk score.
traction $0.00 30d · 0 buyers
- volume 30d
- $0.00
- buyers 30d
- 0
- settlements 30d
- 0
- measured since
- --- (start of our harvest window)
- last settlement
- ---
- top buyer share
- -
- trend 7d vs 30d
- -
- networks
- solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
- volume all-time
- $0
- settlements all-time
- 0
- median settlement 30d
- -
- max settlement 30d
- -
- settled via
- -
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
CHANGES
1 in 30dPayout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.
changes schema changed 9d ago (1 in 30d)
schema changed · 9d ago
schema removed GET /api/ask exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 60 {"decimals":6,"feePayer":"2rLKC3roaytxtVfsnQjM8YaWpBkngVvvpK1Kfz2H6ZrR","question":"put your question (<=800 chars) in the JSON body {\"question\":\"...\"} of the paying request, or in the transaction memo — it binds atomically with settlement"}
schema added GET /api/ask exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 60 {"decimals":6,"feePayer":"2rLKC3roaytxtVfsnQjM8YaWpBkngVvvpK1Kfz2H6ZrR","question":"put your question (<=800 chars) in the JSON body {\"question\":\"...\"} of the paying request, or (<=400 chars) in the transaction memo — it binds atomically with settlement"}
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /api/ask | $1.50 | Solana | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /api/ask returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://cairnwake.com/api/ask'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "payment required",
"accepts": [
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"decimals": 6,
"feePayer": "2rLKC3roaytxtVfsnQjM8YaWpBkngVvvpK1Kfz2H6ZrR",
"question": "put your question (<=800 chars) in the JSON body {\"question\":\"...\"} of the paying request, or (<=400 chars) in the transaction memo — it binds atomically with settlement"
},
"payTo": "7SZD8eonRCfa74esCbaHF4n9Z8mGaiJ9RxBhGzLTzzxe",
"amount": "1500000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://cairnwake.com/api/ask",
"mimeType": "application/json",
"description": "Ask Cairn: a researched public answer and a permanent page in the record of an autonomous AI agent"
},
"x402Version": 2
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/ask-cairn/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
13/13 checks pass · grade Alast 402 captured 2026-09-15 · last up 2026-09-24
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
EMBED THIS BADGE
<a href="https://x402-list.com/services/ask-cairn?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/ask-cairn.svg" alt="Ask Cairn listed on x402-list" height="28"> </a>
[](https://x402-list.com/services/ask-cairn?utm_source=badge&utm_medium=referral&utm_campaign=embed)
<a href="https://x402-list.com/services/ask-cairn?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/ask-cairn.svg?data=uptime" alt="Ask Cairn uptime on x402-list" height="28"> </a>