payment-ready until 2026-08-20
Agents buy per-signal bundles via x402 and get pushed (Telegram) the instant a city's daily-high temperature crosses into a new Polymarket bucket — market URL, old/new reading, and live odds for every bucket. 37 cities.
Pay from $0.10 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
first settlement 2026-07-14 · $1.74 all-time · settled via coinbase, payAI
ASSESSMENT
updated 4h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 99.9%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 99.9%
- uptime 90d
- 99.9%
- response p95
- 704ms
- avg response
- 383ms
- total checks
- 2,687
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 $0.10 (p93 in Data)
- price (min)
- $0.10
- category percentile (min)
- p93 in Data
- endpoints / prices
- 2 / 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
- 40d
- registrar
- Namecheap Inc.
- hosting
- custom
- domain created
- 2026-07-03
Identity facts, not a risk score.
traction $1.73 30d · 5 buyers
- volume 30d
- $1.73
- buyers 30d
- 5
- settlements 30d
- 173
- first settlement
- 2026-07-14
- last settlement
- 2026-08-13
- top buyer share
- 40% of 30d volume
- trend 7d vs 30d
- 0.35x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $1.74
- settlements all-time
- 174
- median settlement 30d
- $0.01
- max settlement 30d
- $0.01
- settled via
- coinbase ($1.23, 123 tx), payAI ($0.50, 50 tx)
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.
WHAT IT DOES
ai-derivedProvides weather-based market signals for temperature thresholds across different cities.
- category
- weather-market-data
- in
- query params
- auth
- api key
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /v1/signals | $0.10 | Base | USDC | header | |
| POST | /v1/subscribe | $0.10 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /v1/signals returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://api.isocast.dev/v1/signals'
// 402 response (captured by monitor) · 2 payloads · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x44b16952484b6dbea40ede12927ee03a5ea6cdd3",
"amount": "100000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.isocast.dev/v1/subscribe",
"mimeType": "application/json",
"description": "Buy the next N Polymarket weather-signal(s) for a city (bundle prepay, count ≥ 2, $0.01–$7.00). Returns a Bearer receipt for /v1/signals. Nonce binds (payer, citySlug, count)."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"city": "istanbul",
"count": 20
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"city": "istanbul",
"count": 20,
"amountUsd": 0.1,
"idempotent": false,
"receiptToken": "ic_rcpt_…",
"unitPriceUsd": 0.005,
"paidThroughSeq": 24
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"required": [
"city",
"count"
],
"properties": {
"city": {
"type": "string",
"description": "City slug (see GET /v1/cities), e.g. istanbul, nyc, los-angeles"
},
"count": {
"type": "integer",
"minimum": 2,
"description": "Number of signals to buy (integer ≥ 2, and total ≥ 0.01 USDC min spend)"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x44b16952484b6dbea40ede12927ee03a5ea6cdd3",
"amount": "100000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.isocast.dev/v1/signals",
"mimeType": "application/json",
"description": "Read entitled Polymarket weather signals for a city; pay inline (x402) or present the Bearer receipt from /v1/subscribe. Each signal: market URL + conditionId, old/new temperature bucket, live odds for every bucket. 402 on exhaustion."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"city": "istanbul"
}
},
"output": {
"type": "json",
"example": {
"more": false,
"latest": 12,
"signals": [
{
"new": {
"unit": "C",
"bucket": "29-30°C",
"reading": 30.1
},
"old": {
"unit": "C",
"bucket": "28-29°C",
"reading": 28.9
},
"seq": 1,
"city": "istanbul",
"buckets": [
{
"no": 0.45,
"yes": 0.55,
"label": "29-30°C"
}
],
"marketUrl": "https://polymarket.com/event/highest-temperature-in-istanbul-on-july-3-2026",
"targetDate": "2026-07-03",
"conditionId": "0x…"
}
],
"next_cursor": 1,
"paid_through": 24
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"city"
],
"properties": {
"city": {
"type": "string",
"description": "City slug (see GET /v1/cities)"
},
"count": {
"type": "integer",
"default": 20,
"minimum": 2,
"description": "Bundle size proposed in the 402 challenge if payment is required"
},
"since": {
"type": "integer",
"default": 0,
"minimum": 0,
"description": "Return signals with seq strictly greater than this (cursor)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"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/isocast/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 2 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 2026-07-14 · 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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