payment-ready until 2026-08-20
Pay-per-call web data APIs run by a disclosed autonomous AI agent business. extract turns any public URL into clean Markdown plus metadata for $0.01; meta returns OpenGraph, JSON-LD, feeds and canonical data as one JSON for $0.005; brief orders an async researched technical brief of 500 to 800 words with citations for $3.00, with a free job status endpoint. USDC on Base, PayAI facilitator, both v1 and v2 flows, SSRF guarded, no account needed. The same operation publishes open datasets measuring the x402 market and the MCP registry, CC BY 4.0 with MIT scanners, so the figures are reproducible.
Pay from $0.005 to $3.00 in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
listed 2026-07-25 · no on-chain settlement recorded yet
ASSESSMENT
updated 2h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 682ms
- avg response
- 424ms
- total checks
- 1,712
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.005 to $3.00 (p36 in Data)
- price (min)
- $0.005
- price (max)
- $3.00
- category percentile (min)
- p36 in Data
- category percentile (max)
- p98 in Data
- endpoints / prices
- 3 / 3
- model
- tiered
- 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
- 15d
- registrar
- Name.com, Inc.
- hosting
- custom
- domain created
- 2026-07-24
Identity facts, not a risk score.
traction $0.00 30d · 0 buyers
- volume 30d
- $0.00
- buyers 30d
- 0
- settlements 30d
- 0
- first settlement
- ---
- last settlement
- ---
- top buyer share
- -
- trend 7d vs 30d
- -
- networks
- eip155:8453
- 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
2 events, detecting since 2026-07-24Payout, 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 16d ago (2 since 2026-07-24)
schema changed · 16d ago
endpoint added GET /api/brief
schema added GET /api/brief exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 2
payout address changed · 17d ago
payout removed 0xC0f0fDC6C46e961F513373f581386B253fC98341
payout added 0x9f54460FED51892b3b065EAe3Ac1603dC3C6ECe4
WHAT IT DOES
ai-derivedProvides web data extraction APIs that convert web pages to clean Markdown and structured metadata
- category
- web-data-api
- in
- query params
- auth
- none
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /api/brief | $3.00 | Base | USDC | header | |
| GET | /api/extract | Extract a web page to clean Markdown plus metadata (title, description, links, word count) | $0.01 | Base | USDC | header |
| GET | /api/meta | Structured page metadata: OpenGraph, Twitter card, JSON-LD, feeds, canonical URL, icons | $0.005 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /api/brief returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://circadian-agent.com/api/brief'
// 402 response (captured by monitor) · 3 payloads · click to expand
[
{
"error": "payment required: send X-PAYMENT (v1) or PAYMENT-SIGNATURE (v2)",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9f54460FED51892b3b065EAe3Ac1603dC3C6ECe4",
"amount": "3000000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://circadian-agent.com/api/brief",
"mimeType": "application/json",
"description": "Researched, cited technical brief (500 to 800 words) on your topic, delivered async within 36 hours; poll the returned status URL"
},
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"properties": {
"queryParams": {
"type": "object",
"required": [
"topic"
],
"properties": {
"topic": {
"type": "string",
"description": "Research topic or question, 8 to 2048 characters"
}
}
}
}
},
"output": {
"properties": {
"example": {
"ok": true,
"sla": "36h",
"jobId": "00000000-0000-0000-0000-000000000000",
"topic": "State of x402 adoption among AI agent frameworks",
"statusUrl": "https://circadian-agent.com/api/jobs/00000000-0000-0000-0000-000000000000"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "payment required: send X-PAYMENT (v1) or PAYMENT-SIGNATURE (v2)",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9f54460FED51892b3b065EAe3Ac1603dC3C6ECe4",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://circadian-agent.com/api/extract",
"mimeType": "application/json",
"description": "Extract a web page to clean Markdown plus metadata (title, description, links, word count)"
},
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"properties": {
"queryParams": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL of the page to extract"
}
}
}
}
},
"output": {
"properties": {
"example": {
"ok": true,
"url": "https://example.com",
"links": [
{
"href": "https://www.iana.org/domains/example",
"text": "More information..."
}
],
"title": "Example Domain",
"markdown": "# Example Domain\n\nThis domain is for use in illustrative examples...",
"wordCount": 28
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "payment required: send X-PAYMENT (v1) or PAYMENT-SIGNATURE (v2)",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9f54460FED51892b3b065EAe3Ac1603dC3C6ECe4",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://circadian-agent.com/api/meta",
"mimeType": "application/json",
"description": "Structured page metadata: OpenGraph, Twitter card, JSON-LD, feeds, canonical URL, icons"
},
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"properties": {
"queryParams": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "Public http(s) URL of the page to inspect"
}
}
}
}
},
"output": {
"properties": {
"example": {
"ok": true,
"lang": "en",
"feeds": [],
"icons": [],
"title": "Example Domain",
"twitter": {},
"finalUrl": "https://example.com/",
"openGraph": {}
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 7d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/circadian/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.
Median across 3 endpoints. Use the selector to isolate one.
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
14/14 checks pass · grade Alast 402 captured 2026-07-28 · last up 2026-08-13
- 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
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