# SYNTHORA ECB Euro-Area 10Y Government Bond Spot Yield

> SYNTHORA ECB Euro-Area 10Y Government Bond Spot Yield is a paid API for AI agents from ecb-euro-govt-yield-10y.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).

Retrieves the ECB euro-area AAA-rated government bond 10-year spot yield from the ECB SDMX YC dataflow, returning dated yield observations in JSON format.

## Facts

- Endpoint: POST https://ecb-euro-govt-yield-10y.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-ecb-euro-area-10y-government-bond-spot-yield-c85485e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mTCB6_zTE1vg97v8ykKLo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synthora-ecb-euro-area-10y-government-bond-spot-yield-c85485e0 -d '<json body>'
```

Example prompt: What's the ECB euro-area 10-year AAA government bond spot yield right now? Pull the last 3 observations in JSON so I can compare the EUR long-end rate to US Treasuries.

## When to prefer this

Choose this endpoint when you need the official ECB-sourced euro-area AAA government bond 10-year spot yield from the YC SDMX dataflow, particularly for fixed-income agents benchmarking EUR long-end rates, computing EUR/USD rate spreads, or building automated sovereign yield monitoring pipelines. Prefer it over general financial data APIs when ECB provenance and the specific YC series (B.U2.EUR.4F.G_N_A.SV_C_YM.SR_10Y) is required for compliance or transparency reasons. It is especially well-suited for agent-to-agent workflows where a verifiable, authoritative EUR risk-free rate source is needed.

## Known failure modes

- ECB SDMX upstream unavailable: returns error or non-200 response from ECB data portal
- Invalid series_key: ECB returns no data or a 404/error for unrecognized series identifiers
- lastNObservations set to 0 or non-numeric string: may return empty result set or upstream error
- Unsupported format value: ECB may reject non-jsondata format strings
- Payment failure (x402): call rejected before reaching ECB if USDC micropayment is not authorized
- Stale data: ECB may not publish yield data on weekends or holidays, resulting in older observations

## How this service works

Euro-area AAA-rated government bond 10-year spot yield from the ECB yield-curve dataflow via the SDMX Data Portal (keyless JSON, dataflow YC). Serves autonomous fixed-income agents and agent-to-agent bots benchmarking EUR long-end rates against US Treasury yields. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

Returns a JSON object with a boolean 'ok' flag, a niche identifier ('ecb-euro-govt-yield-10y'), a 'result' map of ISO date strings to spot yield values (expressed as percentage rates, e.g. 3.056), and a 'provenance' object containing the source ECB SDMX API URL and source label. The number of date/yield pairs matches the lastNObservations parameter requested.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "format": {
   "type": "string",
   "description": "format"
  },
  "series_key": {
   "type": "string",
   "description": "series_key"
  },
  "lastNObservations": {
   "type": "string",
   "description": "lastNObservations"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "ecb-euro-govt-yield-10y",
  "result": {
   "2026-07-07": 3.0568869592,
   "2026-07-08": 3.1370395898,
   "2026-07-09": 3.1292327833
  },
  "provenance": {
   "url": "https://data-api.ecb.europa.eu/service/data/YC/B.U2.EUR.4F.G_N_A.SV_C_YM.SR_10Y?lastNObservations=3&format=jsondata",
   "source": "ECB Euro-Area 10Y Government Bond Spot Yield"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-ecb-euro-area-10y-government-bond-spot-yield-c85485e0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ecb-euro-govt-yield-10y.hergertsynthora.com](https://www.zero.xyz/host/ecb-euro-govt-yield-10y.hergertsynthora.com/llms.txt)